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Document And Entity Information - shares	3 Months Ended
Document And Entity Information - shares	Mar. 31, 2012	Apr. 20, 2012
Document And Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Mar. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Registrant Name	MARTIN MARIETTA MATERIALS INC
Entity Central Index Key	0000916076
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		45,748,026

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Current Assets:
Cash and cash equivalents	$ 44,950	$ 26,022	$ 176,829
Accounts receivable, net	212,052	203,748	203,242
Inventories, net	333,487	322,607	331,679
Current deferred income tax benefits	79,002	80,674	88,805
Other current assets	32,453	24,799	39,806
Total Current Assets	701,944	657,850	840,361
Property, plant and equipment	3,721,378	3,688,692	3,589,883
Allowances for depreciation, depletion and amortization	(1,952,450)	(1,914,401)	(1,913,562)
Net property, plant and equipment	1,768,928	1,774,291	1,676,321
Goodwill	616,729	616,671	626,527
Other intangibles, net	53,224	54,133	17,166
Other noncurrent assets	41,292	44,877	48,231
Total Assets	3,182,117	3,147,822	3,208,606
Current Liabilities:
Bank overdraft	1,929
Accounts payable	100,082	92,210	74,914
Accrued salaries, benefits and payroll taxes	12,389	16,732	9,239
Pension and postretirement benefits	6,612	5,250	4,234
Accrued insurance and other taxes	24,025	26,408	24,326
Current maturities of long-term debt and short-term facilities	7,650	7,182	7,101
Accrued interest	18,304	7,669	26,914
Other current liabilities	14,380	18,261	12,034
Total Current Liabilities	185,371	173,712	158,762
Long-term debt	1,127,178	1,052,902	1,161,518
Pension, postretirement and postemployment benefits	156,076	158,101	129,592
Noncurrent deferred income taxes	225,554	222,064	240,586
Other noncurrent liabilities	89,656	92,179	83,402
Total Liabilities	1,783,835	1,698,958	1,773,860
Equity:
Common stock, par value $0.01 per share	456	456	455
Preferred stock, par value $0.01 per share
Additional paid-in capital	405,473	401,864	400,972
Accumulated other comprehensive loss	(81,991)	(83,890)	(54,564)
Retained earnings	1,035,739	1,090,891	1,046,346
Total Shareholders' Equity	1,359,677	1,409,321	1,393,209
Noncontrolling interests	38,605	39,543	41,537
Total Equity	1,398,282	1,448,864	1,434,746
Total Liabilities and Equity	$ 3,182,117	$ 3,147,822	$ 3,208,606

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Equity:
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Preferred stock, par value	$ 0.01	$ 0.01	$ 0.01

Consolidated Statements Of Earnings And Comprehensive Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Consolidated Statements Of Earnings And Comprehensive Earnings [Abstract]
Net Sales	$ 350,537	$ 290,636
Freight and delivery revenues	43,442	37,307
Total revenues	393,979	327,943
Cost of sales	326,708	267,981
Freight and delivery costs	43,442	37,307
Total cost of revenues	370,150	305,288
Gross Profit	23,829	22,655
Selling, general & administrative expenses	33,029	28,640
Business development costs	25,901	972
Other operating expenses and (income), net	223	(2,509)
Loss from Operations	(35,324)	(4,448)
Interest expense	13,487	18,165
Other nonoperating (income) and expenses, net	(1,855)	(261)
Loss from continuing operations before taxes on income	(46,956)	(22,352)
Income tax benefit	(9,875)	(6,111)
Loss from Continuing Operations	(37,081)	(16,241)
Loss on discontinued operations, net of related tax benefit of $101 and $285, respectively	(592)	(1,456)
Consolidated net loss	(37,673)	(17,697)
Less: Net loss attributable to noncontrolling interests	(941)	(283)
Net Loss Attributable to Martin Marietta Materials, Inc.	(36,732)	(17,414)
Net Loss Attributable to Martin Marietta Materials, Inc.
Loss from continuing operations	(36,140)	(15,958)
Loss from discontinued operations	(592)	(1,456)
Net Loss Attributable to Martin Marietta Materials, Inc.	(36,732)	(17,414)
Consolidated Comprehensive Loss
Loss attributable to Martin Marietta Materials, Inc.	(34,833)	(18,318)
Loss attributable to noncontrolling interests	(938)	(282)
Comprehensive loss net of tax	$ (35,771)	$ (18,600)
Net Loss Attributable to Martin Marietta Materials, Inc.
Continuing operations attributable to common shareholders	$ (0.80)	$ (0.36)
Discontinued operations attributable to common shareholders	(0.01)	(0.03)
Basic net earnings available to common shareholders	$ (0.81)	$ (0.39)
Weighted-Average Common Shares Outstanding
Basic and Diluted	45,734	45,584
Cash Dividends Per Common Share	$ 0.40	$ 0.40

Consolidated Statements Of Earnings And Comprehensive Earnings (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Consolidated Statements Of Earnings And Comprehensive Earnings [Abstract]
Loss on discontinued operations related tax benefit	$ 101	$ 285

- Definition

Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References

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+ Details

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash Flows from Operating Activities:
Consolidated net loss	$ (37,673)	$ (17,697)
Adjustments to reconcile consolidated net loss to net cash (used for) provided by operating activities:
Depreciation, depletion and amortization	44,398	43,294
Stock-based compensation expense	1,878	2,777
Losses (Gains) on divestitures and sales of assets	447	(3,042)
Deferred income taxes	(722)	3,350
Excess tax benefits from stock-based compensation transactions	(288)	(268)
Other items, net	738	625
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable, net	(8,304)	(19,320)
Inventories, net	(10,881)	216
Accounts payable	7,718	14,519
Other assets and liabilities, net	(1,630)	(3,128)
Net Cash (Used for) Provided by Operating Activities	(4,319)	21,326
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(37,518)	(30,674)
Acquisitions, net	(54)	(55)
Proceeds from divestitures and sales of assets	2,184	2,188
Net Cash Used for Investing Activities	(35,388)	(28,541)
Cash Flows from Financing Activities:
Borrowings of long-term debt	151,000	300,000
Repayments of long-term debt	(76,480)	(162,207)
Debt issuance costs	(300)	(3,120)
Change in bank overdraft	1,929	(2,123)
Dividends paid	(18,420)	(18,400)
Distributions to owners of noncontrolling interests		(1,000)
Issuances of common stock	618	303
Excess tax benefits from stock-based compensation transactions	288	268
Net Cash Provided by Financing Activities	58,635	113,721
Net Increase in Cash and Cash Equivalents	18,928	106,506
Cash and Cash Equivalents, beginning of period	26,022	70,323
Cash and Cash Equivalents, end of period	44,950	176,829
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	2,632	2,042
Cash (refunds) payments for income taxes	$ (4,634)	$ 390

Consolidated Statement Of Total Equity - 3 months ended Mar. 31, 2012 - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]	Total Shareholders' Equity [Member]	Noncontrolling Interests [Member]	Total
Balance at Dec. 31, 2011	$ 456	$ 401,864	$ (83,890)	$ 1,090,891	$ 1,409,321	$ 39,543	$ 1,448,864
Balance, Shares at Dec. 31, 2011	45,726
Consolidated net loss				(36,732)	(36,732)	(941)	(37,673)
Other comprehensive earnings			1,899		1,899	3	1,902
Dividends declared				(18,420)	(18,420)		(18,420)
Issuances of common stock for stock award plans		1,731			1,731		1,731
Issuances of common stock for stock award plans, shares	16
Stock-based compensation expense		1,878			1,878		1,878
Balance at Mar. 31, 2012	$ 456	$ 405,473	$ (81,991)	$ 1,035,739	$ 1,359,677	$ 38,605	$ 1,398,282
Balance, Shares at Mar. 31, 2012	45,742

- Definition

This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

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- Definition

This element represents Other Comprehensive Income or Loss, Net of Tax, for the period. Includes deferred gains or losses on qualifying hedges, unrealized holding gains or losses on available-for-sale securities, minimum pension liability, and cumulative translation adjustment. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

+ References

+ Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ Details

- Definition

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

+ References + Details

- Definition

Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

+ References + Details

- Definition

Total of Stockholders' Equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity including portions attributable to both the parent and noncontrolling interests (previously referred to as minority interest), if any. The entity including portions attributable to the parent and noncontrolling interests is sometimes referred to as the economic entity. This excludes temporary equity and is sometimes called permanent equity.

+ References + Details

Significant Accounting Policies

3 Months Ended

Mar. 31, 2012

Significant Accounting Policies [Abstract]

Significant Accounting Policies

1.	Significant Accounting Policies

Basis of Presentation

The accompanying unaudited consolidated financial statements of Martin Marietta Materials, Inc. (the "Corporation") have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to the Quarterly Report on Form 10-Q and to Article 10 of Regulation S-X. The Corporation has continued to follow the accounting policies set forth in the audited consolidated financial statements and related notes thereto included in the Corporation's Annual Report on Form 10-K for the year ended December 31, 2011, filed with the Securities and Exchange Commission on February 29, 2012. In the opinion of management, the interim financial information provided herein reflects all adjustments, consisting of normal recurring accruals, necessary for a fair presentation of the results of operations, financial position and cash flows for the interim periods. The results of operations for the quarter ended March 31, 2012 are not indicative of the results expected for other interim periods or the full year. The balance sheet at December 31, 2011 has been derived from the audited financial statements at that date but does not include all of the information and notes required by generally accepted accounting principles for complete financial statements. These financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Corporation's Annual Report on Form 10-K for the year ended December 31, 2011.

Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss

Consolidated comprehensive earnings/loss for the Corporation consist of consolidated net earnings or loss; adjustments for the funded status of pension and postretirement benefit plans; foreign currency translation adjustments; and the amortization of the value of terminated forward starting interest rate swap agreements into interest expense.

Effective January 1, 2012, as required by recent accounting guidance, the Corporation changed its presentation of consolidated comprehensive earnings/loss. The Corporation no longer reports total consolidated comprehensive earnings/loss and related components of other comprehensive earnings/loss in its consolidated statement of total equity. Rather, the Corporation presents total consolidated comprehensive earnings/loss in its consolidated statements of earnings and comprehensive earnings for interim periods and in separate but consecutive consolidated statements of comprehensive earnings for annual periods. Prior year information has been recast to conform to this presentation approach.

Changes in accumulated other comprehensive loss, net of tax, are as follows:


	Three Months Ended March 31, 2012
	(Dollars in Thousands)

	Pension and Postretirement Benefit Plans		Foreign Currency		Unamortized Value of Terminated Forward Starting Interest Rate Swap		Accumulated Other Comprehensive Loss


Balance at beginning of period	$	(84,204)	$	5,076	$	(4,762)	$	(83,890)
Other comprehensive earnings, net of tax		1,548		199		152		1,899

Balance at end of period	$	(82,656)	$	5,275	$	(4,610)	$	(81,991)

The Corporation had net noncurrent deferred tax assets recorded in accumulated other comprehensive loss as follows:


	Three Months Ended March 31, 2012
	(Dollars in Thousands)

	Pension and Postretirement Benefit Plans		Unamortized Value of Terminated Forward Starting Interest Rate Swap		Net Noncurrent Deferred Tax Assets


Balance at beginning of period	$	55,161	$	3,116	$	58,277
Other comprehensive earnings, tax effect		(1,013)		(99)		(1,112)

Balance at end of period	$	54,148	$	3,017	$	57,165

Earnings (Loss) per Common Share

The numerator for basic and diluted earnings (loss) per common share is net earnings (loss) attributable to Martin Marietta Materials, Inc., reduced by dividends and undistributed earnings attributable to the Corporation's unvested restricted stock awards and incentive stock awards. The denominator for basic earnings (loss) per common share is the weighted-average number of common shares outstanding during the period. Diluted earnings (loss) per common share are computed assuming that the weighted-average number of common shares is increased by the conversion, using the treasury stock method, of awards to be issued to employees and nonemployee members of the Corporation's Board of Directors under certain stock-based compensation arrangements if the conversion is dilutive. For the three months ended March 31, 2012 and 2011, all such awards were antidilutive given the net loss attributable to Martin Marietta Materials, Inc.

The following table reconciles the numerator and denominator for basic and diluted earnings (loss) per common share:


	Three Months Ended March 31,
	2012		2011
	(In Thousands)
Net loss from continuing operations attributable to Martin Marietta Materials, Inc.	$	(36,140)	$	(15,958)
Less: Distributed and undistributed earnings attributable to unvested awards		(126)		(165)

Basic and diluted net loss available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.		(36,266)		(16,123)
Basic and diluted net loss available to common shareholders from discontinued operations		(592)		(1,456)

Basic and diluted net loss available to common shareholders attributable to Martin Marietta Materials, Inc.	$	(36,858)	$	(17,579)


Basic weighted-average common shares outstanding		45,734		45,584
Effect of dilutive employee and director awards		--		--

Diluted weighted-average common shares outstanding		45,734		45,584

Discontinued Operations

3 Months Ended

Mar. 31, 2012

Discontinued Operations [Abstract]

Discontinued Operations

2.	Discontinued Operations

Divestitures and Permanent Closures

Operations that are disposed of or permanently shut down represent discontinued operations, and, therefore, the results of their operations through the dates of disposal and any gain or loss on disposals are included in discontinued operations in the consolidated statements of earnings and comprehensive earnings. The results of operations for divestitures do not include Corporate overhead that was allocated during the periods the Corporation owned these operations.

All discontinued operations relate to the Aggregates business. Discontinued operations consist of the following:


	Three Months Ended March 31,
	2012		2011
	(Dollars in Thousands)

Net sales	$	(356)	$	15,625


Pretax loss on operations	$	(339)	$	(1,741)
Pretax loss on disposals		(354)		--

Pretax loss		(693)		(1,741)
Income tax benefit		(101)		(285)

Net loss	$	(592)	$	(1,456)

- Definition

The entire disclosure for the facts and circumstances leading to the completed or expected disposal, manner and timing of disposal, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the segment in which the disposal group was reported, and the classification (whether sold or classified as held for sale) and carrying value of the assets and liabilities comprising the disposal group. Includes all disposal groups, including those classified as components of the entity (discontinued operations).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 43-48
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760

+ Details

Inventories, Net

3 Months Ended

Mar. 31, 2012

Inventories, Net [Abstract]

Inventories, Net

3.	Inventories, Net


	March 31, 2012		December 31, 2011		March 31, 2011
	(Dollars in Thousands)

Finished products	$	357,953	$	350,685	$	361,956
Products in process and raw materials		15,751		11,116		12,254
Supplies and expendable parts		54,010		53,287		49,025

		427,714		415,088		423,235
Less allowances		(94,227)		(92,481)		(91,556)

Total	$	333,487	$	322,607	$	331,679

Goodwill And Intangible Assets

3 Months Ended

Mar. 31, 2012

Goodwill And Intangible Assets [Abstract]

Goodwill And Intangible Assets

4.	Goodwill and Intangible Assets

Changes in goodwill, all of which relate to the Aggregates business, by reportable segment and in total are as follows (dollars in thousands):


	Three Months Ended March 31, 2012
	Mideast Group		Southeast Group		West Group		Total

Balance at beginning of period	$	122,052	$	72,073	$	422,546	$	616,671
Adjustments to purchase price allocations		--		--		58		58
District reorganization		(9,229)		9,229		--		--

Balance at end of period	$	112,823	$	81,302	$	422,604	$	616,729

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Long-Term Debt

3 Months Ended

Mar. 31, 2012

Long-Term Debt [Abstract]

Long-Term Debt

5.	Long-Term Debt


	March 31, 2012		December 31, 2011		March 31, 2011
	(Dollars in Thousands)
6.6% Senior Notes, due 2018	$	298,525	$	298,476	$	298,333
7% Debentures, due 2025		124,424		124,417		124,399
6.25% Senior Notes, due 2037		228,089		247,915		247,890
6.875% Notes, due 2011		--		--		242,140
Term Loan Facility, due 2015, interest rate of 1.87% at March 31, 2012; 2.20% at December 31, 2011; and 1.93% at March 31, 2011		245,000		250,000		250,000
Revolving Facility, interest rate of 1.62% at March 31, 2012 and 2.64% at December 31, 2011		135,000		35,000		--
AR Credit Facility, interest rate of 1.60% at March 31, 2012 and 1.66% at December 31, 2011		100,000		100,000		--
Other notes		3,790		4,276		5,857

Total debt		1,134,828		1,060,084		1,168,619
Less current maturities		(7,650)		(7,182)		(7,101)

Long-term debt	$	1,127,178	$	1,052,902	$	1,161,518

On January 23, 2012, the Corporation repurchased $20,000,000 par value of its outstanding 6.25% Senior Notes due 2037 at 90.75. This repurchase was financed with borrowings of $18,200,000 under the Corporation's Revolving Facility.

On April 13, 2012, the Corporation renewed its AR Credit Facility for a one-year term ending April 20, 2013.

The Credit Agreement and the AR Credit Facility require the Corporation's ratio of consolidated debt to consolidated earnings before interest, taxes, depreciation, depletion and amortization (EBITDA), as defined, for the trailing twelve month period (the "Ratio") to not exceed 3.50x as of the end of any fiscal quarter, provided that the Corporation may exclude from the Ratio debt incurred in connection with certain acquisitions for a period of 180 days so long as the Corporation maintains specified ratings on its long-term unsecured debt and the Ratio calculated without such exclusion does not exceed 3.75x. Additionally, if no amounts are outstanding under both the Revolving Facility and the AR Credit Facility, consolidated debt, including debt guaranteed by the Corporation, may be reduced by the Corporation's unrestricted cash and cash equivalents in excess of $50,000,000, such reduction not to exceed $200,000,000, for purposes of the covenant calculation.

The Corporation amended the Ratio to ensure that the impact of business development costs for the proposed business combination with Vulcan Materials Company ("Vulcan") and the seasonal working capital requirements of the Corporation's newly-acquired Colorado operations do not impair liquidity available under the Corporation's Credit Agreement and AR Credit Facility. The amendments temporarily increase the maximum Ratio to 3.95x at March 31, 2012 and June 30, 2012, stepping down to 3.75x at September 30, 2012. The Ratio returns to the pre-amendment maximum of 3.50x for the December 31, 2012 calculation date. The amendments also allow the Corporation to exclude from the Ratio at March 31, 2012 and June 30, 2012 debt associated with the newly-acquired Colorado operations, which was allowed only through the March 31, 2012 calculation date prior to the amendments.

Accumulated other comprehensive loss includes the unamortized value of terminated forward starting interest rate swap agreements. For the three months ended March 31, 2012 and 2011, the Corporation recognized $251,000 and $234,000, respectively, as additional interest expense. The ongoing amortization of the terminated value of the forward starting interest rate swap agreements will increase annual interest expense by approximately $1,000,000 until the maturity of the 6.6% Senior Notes in 2018.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Financial Instruments

3 Months Ended

Mar. 31, 2012

Financial Instruments [Abstract]

Financial Instruments

6.	Financial Instruments

The Corporation's financial instruments include temporary cash investments, accounts receivable, notes receivable, bank overdraft, publicly registered long-term notes, debentures and other long-term debt.

Temporary cash investments are placed primarily in money market funds, money market demand deposit accounts and Eurodollar time deposits with the following financial institutions: Bank of America, N.A., Branch Banking and Trust Company, JPMorgan Chase Bank, N.A., Regions Bank, Fifth Third Bank, and Wells Fargo Bank, N.A. The Corporation's cash equivalents have maturities of less than three months. Due to the short maturity of these investments, they are carried on the consolidated balance sheets at cost, which approximates fair value.

Customer receivables are due from a large number of customers, primarily in the construction industry, and are dispersed across wide geographic and economic regions. However, customer receivables are more heavily concentrated in certain states (namely, Texas, North Carolina, Iowa, Georgia and South Carolina which accounted for approximately 57% of the Aggregate business' 2011 net sales). The estimated fair values of customer receivables approximate their carrying amounts.

Notes receivable are primarily related to divestitures and are not publicly traded. However, using current market interest rates, but excluding adjustments for credit worthiness, if any, management estimates that the fair value of notes receivable approximates the carrying amount.

The bank overdraft represents the float of outstanding checks. The estimated fair value of the bank overdraft approximates its carrying value.

The carrying values and fair values of the Corporation's long-term debt were $1,134,828,000 and $1,129,890,000, respectively, at March 31, 2012; $1,060,084,000 and $1,087,726,000, respectively, at December 31, 2011; and $1,168,619,000 and $1,183,716,000, respectively, at March 31, 2011. The estimated fair value of the Corporation's publicly registered long-term notes was estimated based on level 1 of the fair value hierarchy, quoted market prices. The estimated fair value of other borrowings, which primarily represent variable-rate debt, approximates its carrying amount.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44A, 44B
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15C, 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15A
-Subparagraph a-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32, 33, 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 17-22, 27, 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19296-110258

+ Details

Income Taxes

3 Months Ended

Mar. 31, 2012

Income Taxes [Abstract]

Income Taxes

7.	Income Taxes


	Three Months Ended March 31,
	2012	2011
Estimated effective income tax rate:
Continuing operations	21.0%	27.3%

Discontinued operations	14.6%	16.4%

Consolidated overall	20.9%	26.6%

The Corporation's effective income tax rate reflects the effect of federal and state income taxes and the impact of differences in book and tax accounting arising from the net permanent benefits associated with the statutory depletion deduction for mineral reserves, the impact of foreign losses for which no tax benefit was realized and the domestic production deduction. The effective income tax rates for discontinued operations reflect the tax effects of individual operations' transactions and are not indicative of the Corporation's overall effective income tax rate.

On December 23, 2011, the U.S. Treasury Department issued comprehensive temporary and proposed regulations addressing the treatment of expenditures related to tangible property for tax purposes. On March 7, 2012, the Internal Revenue Service ("IRS") issued two revenue procedures containing administrative guidance related to the adoption of the new rules. Although the regulations are generally effective for tax years beginning January 1, 2012, the IRS has granted taxpayers administrative relief and audit protection for a two-year period as long as the taxpayer adopts the regulations retroactively within two years of the effective date. Management has begun to evaluate the changes necessary to comply with the regulations and the related administrative procedures and is not currently aware of any adjustments that would be material to the Corporation's consolidated financial position and results of operations. As part of its compliance, the Corporation reversed its unrecognized tax benefits related to repairs and maintenance as of March 31, 2012.

The Corporation's unrecognized tax benefits, excluding interest and correlative effects, are as follows:


	Three Months Ended March 31, 2012
	(Dollars in Thousands)
Unrecognized tax benefits at beginning of period	$	9,288
Gross increases – tax positions in prior years		9,366
Gross decreases – tax positions in prior years		(13,876)
Gross increases – tax positions in current year		452
Settlements with taxing authorities		(554)

Unrecognized tax benefits at end of period	$	4,676

At March 31, 2012, unrecognized tax benefits of $5,472,000, net of federal tax benefits and related to interest accruals and permanent income tax differences, would have favorably affected the Corporation's effective income tax rate if recognized.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

+ Details

Pension And Postretirement Benefits

3 Months Ended

Mar. 31, 2012

Pension And Postretirement Benefits [Abstract]

Pension And Postretirement Benefits

8.	Pension and Postretirement Benefits

The estimated components of the recorded net periodic benefit cost for pension and postretirement benefits are as follows (dollars in thousands):


	Three Months Ended March 31,
	Pension				Postretirement Benefits
	2012		2011		2012		2011
Service cost	$	3,600	$	2,973	$	66	$	124
Interest cost		5,941		5,862		315		614
Expected return on assets		(5,970)		(6,051)		--		--
Amortization of:
Prior service cost (credit)		122		133		(814)		(435)
Actuarial loss (gain)		3,321		1,866		(64)		--
Settlement charge		--		14		--		--

Net periodic benefit cost (credit)	$	7,014	$	4,797	$	(497)	$	303

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 5
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 5
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

+ Details

Commitments And Contingencies

3 Months Ended

Mar. 31, 2012

Commitments And Contingencies [Abstract]

Commitments And Contingencies

9.	Commitments and Contingencies

Legal and Administrative Proceedings

The Corporation is engaged in certain legal and administrative proceedings incidental to its normal business activities and its proposed business combination with Vulcan. In the opinion of management and counsel, based upon currently-available facts, it is remote that the ultimate outcome of any litigation and other proceedings, including those pertaining to environmental matters, relating to the Corporation and its subsidiaries, will have a material adverse effect on the overall results of the Corporation's operations, its cash flows or its financial position.

On May 4, 2012, the Court of Chancery of the State of Delaware (the "Court") issued a post-trial opinion which stated that the Corporation "shall be enjoined for a period of four months from prosecuting a proxy contest, making an exchange or tender offer, or otherwise taking steps to acquire control of Vulcan shares or assets." The opinion also stated that "Vulcan shall submit a conforming final judgment within five days, upon approval as to form by Martin Marietta." On May 7, 2012, the Corporation announced that it will pursue an appeal and seek a stay of the Court's ruling pending the outcome of the appeal. Management continues to believe in the undeniable strategic merits of a business combination with Vulcan and is disappointed with the decision rendered by the Delaware Court of Chancery, with which it strongly disagrees.

If the Corporation is successful in the appeal process, management expects that the independent candidates nominated by the Corporation will stand for election at the Vulcan annual meeting and the Corporation will continue to pursue its exchange offer for Vulcan shares.

If the Corporation is not successful in the appeal process, management may be required by the terms of the Delaware order to suspend its activities with respect to the proposed business combination with Vulcan for four months, including pursuing the election of its four independent nominees to the Vulcan board and its exchange offer.

Management presently intends to continue its efforts to combine with Vulcan, including pursuing its exchange offer, as soon as permitted to do so. Management will, of course, make decisions as to how to proceed based on relevant circumstances.

Guarantee of Affiliate

The Corporation has an unconditional guaranty of payment agreement with Fifth Third Bank ("Fifth Third") to guarantee the repayment of amounts borrowed by an affiliate under a $24,000,000 revolving line of credit provided by Fifth Third that expires in July 2013 and a guaranty agreement with Bank of America, N.A., to guarantee a $6,200,000 amortizing loan due April 2016. The affiliate has agreed to reimburse and indemnify the Corporation for any payments and expenses the Corporation may incur from these agreements. The Corporation holds a subordinate lien of the affiliate's assets as collateral for potential payments under the agreements.

- Definition

The entire disclosure for commitments and contingencies.

+ References

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-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 1
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

+ Details

Business Segments

3 Months Ended

Mar. 31, 2012

Business Segments [Abstract]

Business Segments

10.

Business Segments

The Corporation conducts its aggregates operations through three reportable business segments: Mideast Group, Southeast Group and West Group. The Corporation also has a Specialty Products segment that includes magnesia-based chemicals products and dolomitic lime. These segments are consistent with the Corporation's current management reporting structure.

The following tables display selected financial data for continuing operations for the Corporation's reportable business segments. Corporate loss from operations primarily includes depreciation on capitalized interest, expenses for corporate administrative functions, unallocated corporate expenses and other nonrecurring and/or non-operational adjustments.


	Three Months Ended March 31,
	2012		2011
	(Dollars in Thousands)
Total revenues:
Mideast Group	$	84,444	$	76,080
Southeast Group		73,512		67,579
West Group		179,720		130,686

Total Aggregates Business		337,676		274,345
Specialty Products		56,303		53,598

Total	$	393,979	$	327,943


Net sales:
Mideast Group	$	77,184	$	71,340
Southeast Group		67,526		62,709
West Group		154,111		107,446

Total Aggregates Business		298,821		241,495
Specialty Products		51,716		49,141

Total	$	350,537	$	290,636


(Loss) Earnings from operations:
Mideast Group	$	(850)	$	2,052
Southeast Group		(3,728)		(4,197)
West Group		(18,875)		(12,673)

Total Aggregates Business		(23,453)		(14,818)
Specialty Products		18,221		15,129
Corporate		(30,092)		(4,759)

Total	$	(35,324)	$	(4,448)

The asphalt, ready mixed concrete, road paving and other product lines are considered internal customers of the core aggregates business. Product lines for the Specialty Products segment consist of magnesia-based chemicals, dolomitic lime and other. Net sales by product line are as follows:


	Three Months Ended
	March 31,
	2012		2011
	(Dollars in Thousands)
Aggregates	$	256,976	$	222,983
Asphalt		12,542		10,976
Ready Mixed Concrete		20,301		5,314
Road Paving		8,676		2,222
Other		326		--

Total Aggregates Business		298,821		241,495

Magnesia-Based Chemicals		36,398		35,159
Dolomitic Lime		14,973		13,780
Other		345		202

Total Specialty Products		51,716		49,141

Total	$	350,537	$	290,636

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Supplemental Cash Flow Information

3 Months Ended

Mar. 31, 2012

Supplemental Cash Flow Information [Abstract]

Supplemental Cash Flow Information

11.

Supplemental Cash Flow Information

The components of the change in other assets and liabilities, net, are as follows:


	Three Months Ended March 31,
	2012		2011
	(Dollars in Thousands)
Other current and noncurrent assets	$	(2,797)	$	(668)
Accrued salaries, benefits and payroll taxes		(3,517)		(7,129)
Accrued insurance and other taxes		(2,383)		790
Accrued income taxes		(5,306)		(10,610)
Accrued pension, postretirement and postemployment benefits		1,903		1,686
Other current and noncurrent liabilities		10,470		12,803

	$	(1,630)	$	(3,128)

Significant Accounting Policies (Policy)

3 Months Ended

Mar. 31, 2012

Significant Accounting Policies [Abstract]

Basis Of Presentation

Basis of Presentation

Consolidated Comprehensive Earnings/Loss And Accumulated Other Comprehensive Loss

Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss

Changes in accumulated other comprehensive loss, net of tax, are as follows:


	Three Months Ended March 31, 2012
	(Dollars in Thousands)

	Pension and Postretirement Benefit Plans		Foreign Currency		Unamortized Value of Terminated Forward Starting Interest Rate Swap		Accumulated Other Comprehensive Loss


Balance at beginning of period	$	(84,204)	$	5,076	$	(4,762)	$	(83,890)
Other comprehensive earnings, net of tax		1,548		199		152		1,899

Balance at end of period	$	(82,656)	$	5,275	$	(4,610)	$	(81,991)

The Corporation had net noncurrent deferred tax assets recorded in accumulated other comprehensive loss as follows:


	Three Months Ended March 31, 2012
	(Dollars in Thousands)

	Pension and Postretirement Benefit Plans		Unamortized Value of Terminated Forward Starting Interest Rate Swap		Net Noncurrent Deferred Tax Assets


Balance at beginning of period	$	55,161	$	3,116	$	58,277
Other comprehensive earnings, tax effect		(1,013)		(99)		(1,112)

Balance at end of period	$	54,148	$	3,017	$	57,165

Earnings (Loss) Per Common Share

Earnings (Loss) per Common Share

The following table reconciles the numerator and denominator for basic and diluted earnings (loss) per common share:


	Three Months Ended March 31,
	2012		2011
	(In Thousands)
Net loss from continuing operations attributable to Martin Marietta Materials, Inc.	$	(36,140)	$	(15,958)
Less: Distributed and undistributed earnings attributable to unvested awards		(126)		(165)

Basic and diluted net loss available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.		(36,266)		(16,123)
Basic and diluted net loss available to common shareholders from discontinued operations		(592)		(1,456)

Basic and diluted net loss available to common shareholders attributable to Martin Marietta Materials, Inc.	$	(36,858)	$	(17,579)


Basic weighted-average common shares outstanding		45,734		45,584
Effect of dilutive employee and director awards		--		--

Diluted weighted-average common shares outstanding		45,734		45,584

- Definition

Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.

+ References + Details

Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2012

Significant Accounting Policies [Abstract]

Changes In Accumulated Other Comprehensive Loss, Net Of Tax


	Three Months Ended March 31, 2012
	(Dollars in Thousands)

	Pension and Postretirement Benefit Plans		Foreign Currency		Unamortized Value of Terminated Forward Starting Interest Rate Swap		Accumulated Other Comprehensive Loss


Balance at beginning of period	$	(84,204)	$	5,076	$	(4,762)	$	(83,890)
Other comprehensive earnings, net of tax		1,548		199		152		1,899

Balance at end of period	$	(82,656)	$	5,275	$	(4,610)	$	(81,991)

Noncurrent Deferred Tax Assets Recorded In Accumulated Other Comprehensive Loss


	Three Months Ended March 31, 2012
	(Dollars in Thousands)

	Pension and Postretirement Benefit Plans		Unamortized Value of Terminated Forward Starting Interest Rate Swap		Net Noncurrent Deferred Tax Assets


Balance at beginning of period	$	55,161	$	3,116	$	58,277
Other comprehensive earnings, tax effect		(1,013)		(99)		(1,112)

Balance at end of period	$	54,148	$	3,017	$	57,165

Basic And Diluted Earnings (Loss) Per Common Share


	Three Months Ended March 31,
	2012		2011
	(In Thousands)
Net loss from continuing operations attributable to Martin Marietta Materials, Inc.	$	(36,140)	$	(15,958)
Less: Distributed and undistributed earnings attributable to unvested awards		(126)		(165)

Basic and diluted net loss available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.		(36,266)		(16,123)
Basic and diluted net loss available to common shareholders from discontinued operations		(592)		(1,456)

Basic and diluted net loss available to common shareholders attributable to Martin Marietta Materials, Inc.	$	(36,858)	$	(17,579)


Basic weighted-average common shares outstanding		45,734		45,584
Effect of dilutive employee and director awards		--		--

Diluted weighted-average common shares outstanding		45,734		45,584

Discontinued Operations (Tables)

3 Months Ended

Mar. 31, 2012

Discontinued Operations [Abstract]

Schedule Of Discontinued Operations


	Three Months Ended March 31,
	2012		2011
	(Dollars in Thousands)

Net sales	$	(356)	$	15,625


Pretax loss on operations	$	(339)	$	(1,741)
Pretax loss on disposals		(354)		--

Pretax loss		(693)		(1,741)
Income tax benefit		(101)		(285)

Net loss	$	(592)	$	(1,456)

- Definition

Tabular disclosure of disposal groups, which may include the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the classification and carrying value of the assets and liabilities comprising the disposal group, and the segment in which the disposal group was reported. Also may include the amount of adjustments to amounts previously reported in discontinued operations such as resolution of contingencies arising from the disposal transaction or the operations of the component prior to disposal.

+ References + Details

Inventories, Net (Tables)

3 Months Ended

Mar. 31, 2012

Inventories, Net [Abstract]

Schedule Of Inventories, Net


	March 31, 2012		December 31, 2011		March 31, 2011
	(Dollars in Thousands)

Finished products	$	357,953	$	350,685	$	361,956
Products in process and raw materials		15,751		11,116		12,254
Supplies and expendable parts		54,010		53,287		49,025

		427,714		415,088		423,235
Less allowances		(94,227)		(92,481)		(91,556)

Total	$	333,487	$	322,607	$	331,679

Goodwill And Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2012

Goodwill And Intangible Assets [Abstract]

Changes In Goodwill


	Three Months Ended March 31, 2012
	Mideast Group		Southeast Group		West Group		Total

Balance at beginning of period	$	122,052	$	72,073	$	422,546	$	616,671
Adjustments to purchase price allocations		--		--		58		58
District reorganization		(9,229)		9,229		--		--

Balance at end of period	$	112,823	$	81,302	$	422,604	$	616,729

- Definition

Tabular disclosure of goodwill by reportable segment and in total. Disclosure details may include, but are not limited to, the carrying amount of goodwill, goodwill acquired during the year, goodwill impairment losses recognized, goodwill written-off due to the sale of a business unit, goodwill not yet allocated, and any other changes to goodwill.

+ References + Details

Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2012

Long-Term Debt [Abstract]

Long-Term Debt


	March 31, 2012		December 31, 2011		March 31, 2011
	(Dollars in Thousands)
6.6% Senior Notes, due 2018	$	298,525	$	298,476	$	298,333
7% Debentures, due 2025		124,424		124,417		124,399
6.25% Senior Notes, due 2037		228,089		247,915		247,890
6.875% Notes, due 2011		--		--		242,140
Term Loan Facility, due 2015, interest rate of 1.87% at March 31, 2012; 2.20% at December 31, 2011; and 1.93% at March 31, 2011		245,000		250,000		250,000
Revolving Facility, interest rate of 1.62% at March 31, 2012 and 2.64% at December 31, 2011		135,000		35,000		--
AR Credit Facility, interest rate of 1.60% at March 31, 2012 and 1.66% at December 31, 2011		100,000		100,000		--
Other notes		3,790		4,276		5,857

Total debt		1,134,828		1,060,084		1,168,619
Less current maturities		(7,650)		(7,182)		(7,101)

Long-term debt	$	1,127,178	$	1,052,902	$	1,161,518

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

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+ Details

Income Taxes (Tables)

3 Months Ended

Mar. 31, 2012

Income Taxes [Abstract]

Schedule Of Estimated Effective Income Tax Rate


	Three Months Ended March 31,
	2012	2011
Estimated effective income tax rate:
Continuing operations	21.0%	27.3%

Discontinued operations	14.6%	16.4%

Consolidated overall	20.9%	26.6%

Schedule Of Unrecognized Tax Benefits


	Three Months Ended March 31, 2012
	(Dollars in Thousands)
Unrecognized tax benefits at beginning of period	$	9,288
Gross increases – tax positions in prior years		9,366
Gross decreases – tax positions in prior years		(13,876)
Gross increases – tax positions in current year		452
Settlements with taxing authorities		(554)

Unrecognized tax benefits at end of period	$	4,676

- Definition

Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions.

+ References + Details

Pension And Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2012

Pension And Postretirement Benefits [Abstract]

Schedule Of Components Of Net Periodic Benefit Cost


	Three Months Ended March 31,
	Pension				Postretirement Benefits
	2012		2011		2012		2011
Service cost	$	3,600	$	2,973	$	66	$	124
Interest cost		5,941		5,862		315		614
Expected return on assets		(5,970)		(6,051)		--		--
Amortization of:
Prior service cost (credit)		122		133		(814)		(435)
Actuarial loss (gain)		3,321		1,866		(64)		--
Settlement charge		--		14		--		--

Net periodic benefit cost (credit)	$	7,014	$	4,797	$	(497)	$	303

Business Segments (Tables)

3 Months Ended

Mar. 31, 2012

Business Segments [Abstract]

Financial Data For Continuing Operations For The Corporation's Reportable Business Segments


	Three Months Ended March 31,
	2012		2011
	(Dollars in Thousands)
Total revenues:
Mideast Group	$	84,444	$	76,080
Southeast Group		73,512		67,579
West Group		179,720		130,686

Total Aggregates Business		337,676		274,345
Specialty Products		56,303		53,598

Total	$	393,979	$	327,943


Net sales:
Mideast Group	$	77,184	$	71,340
Southeast Group		67,526		62,709
West Group		154,111		107,446

Total Aggregates Business		298,821		241,495
Specialty Products		51,716		49,141

Total	$	350,537	$	290,636


(Loss) Earnings from operations:
Mideast Group	$	(850)	$	2,052
Southeast Group		(3,728)		(4,197)
West Group		(18,875)		(12,673)

Total Aggregates Business		(23,453)		(14,818)
Specialty Products		18,221		15,129
Corporate		(30,092)		(4,759)

Total	$	(35,324)	$	(4,448)

Net Sales By Product Line


	Three Months Ended
	March 31,
	2012		2011
	(Dollars in Thousands)
Aggregates	$	256,976	$	222,983
Asphalt		12,542		10,976
Ready Mixed Concrete		20,301		5,314
Road Paving		8,676		2,222
Other		326		--

Total Aggregates Business		298,821		241,495

Magnesia-Based Chemicals		36,398		35,159
Dolomitic Lime		14,973		13,780
Other		345		202

Total Specialty Products		51,716		49,141

Total	$	350,537	$	290,636

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2012

Supplemental Cash Flow Information [Abstract]

Components Of Change In Other Assets And Liabilities, Net


	Three Months Ended March 31,
	2012		2011
	(Dollars in Thousands)
Other current and noncurrent assets	$	(2,797)	$	(668)
Accrued salaries, benefits and payroll taxes		(3,517)		(7,129)
Accrued insurance and other taxes		(2,383)		790
Accrued income taxes		(5,306)		(10,610)
Accrued pension, postretirement and postemployment benefits		1,903		1,686
Other current and noncurrent liabilities		10,470		12,803

	$	(1,630)	$	(3,128)

Significant Accounting Policies (Changes In Accumulated Other Comprehensive Loss, Net Of Tax) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2012 USD ($)
Balance at beginning of period, Pension and Postretirement Benefit Plans	$ (84,204)
Balance at beginning of period, Foreign Currency	5,076
Balance at beginning of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap	(4,762)
Balance at beginning of period, Accumulated Other Comprehensive Loss	(83,890)
Other comprehensive earnings, net of tax, Pension and Postretirement Benefit Plans	1,548
Other comprehensive earnings, net of tax, Foreign Currency	199
Other comprehensive earnings, net of tax, Unamortized Value of Terminated Forward Starting Interest Rate Swap	152
Other comprehensive earnings, net of tax, Accumulated Other Comprehensive Loss	1,902
Balance at end of period, Pension and Postretirement Benefit Plans	(82,656)
Balance at end of period, Foreign Currency	5,275
Balance at end of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap	(4,610)
Balance at end of period, Accumulated Other Comprehensive Loss	(81,991)
Accumulated Other Comprehensive Loss [Member]
Balance at beginning of period, Accumulated Other Comprehensive Loss	(83,890)
Other comprehensive earnings, net of tax, Accumulated Other Comprehensive Loss	1,899
Balance at end of period, Accumulated Other Comprehensive Loss	$ (81,991)

- Definition

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph i
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-Paragraph 11
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e681-108580

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

+ Details

- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 17, 18, 19, 22, 23, 24, 25, 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 12, 13
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 31
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32022-110900

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e681-108580

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580

+ Details

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

+ Details

- Definition

Adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity, net of tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14, 17, 19, 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 13, 20, 31
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 20
-Subparagraph (b),(c)
-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6920433&loc=d3e998-108581

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Significant Accounting Policies (Noncurrent Deferred Tax Assets Recorded In Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Significant Accounting Policies [Abstract]
Balance at beginning of period, Pension and Postretirement Benefit Plans	$ 55,161
AccumulatedOtherComprehensiveLossNoncurrentDeferredTaxAssetsNet	57,165	$ 58,277
Other comprehensive earnings, tax effect, Pension and Postretirement Benefit Plans	(1,013)
Other comprehensive earnings, tax effect, Unamortized Value of Terminated Forward Starting Interest Rate Swap	(99)
Other comprehensive earnings, tax effect, Net Noncurrent Deferred Tax Assets	(1,112)
Balance at end of period, Pension and Postretirement Benefit Plans	54,148	55,161
Balance at end of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap	3,017	3,116
AccumulatedOtherComprehensiveLossNoncurrentDeferredTaxAssetsNet	$ 57,165	$ 58,277

Significant Accounting Policies (Basic And Diluted Earnings (Loss) Per Common Share) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Significant Accounting Policies [Abstract]
Net loss from continuing operations attributable to Martin Marietta Materials, Inc.	$ (36,140)	$ (15,958)
Less: Distributed and undistributed earnings attributable to unvested awards	(126)	(165)
Basic and diluted net loss available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.	(36,266)	(16,123)
Basic and diluted net loss available to common shareholders from discontinued operations	(592)	(1,456)
Basic and diluted net loss available to common shareholders attributable to Martin Marietta Materials, Inc.	$ (36,858)	$ (17,579)
Basic weighted-average common shares outstanding	45,734	45,584
Effect of dilutive employee and director awards
Diluted weighted-average common shares outstanding	45,734	45,584

- Definition

This element represents the income or loss from continuing operations attributable to the parent which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 29
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph b(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=6921628&loc=SL4613673-111683

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.13)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

+ Details

- Definition

This element represents the overall income (loss) from a disposal group apportioned to the parent that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount which may be allocable to noncontrolling interests, if any. Includes the following (net of tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References + Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (a)
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-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1448-109256

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Discontinued Operations (Schedule Of Discontinued Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Discontinued Operations [Abstract]
Net sales	$ (356)	$ 15,625
Pretax loss on operations	(339)	(1,741)
Pretax loss on disposals	(354)
Pretax loss	(693)	(1,741)
Income tax benefit	(101)	(285)
Net loss	$ (592)	$ (1,456)

- Definition

Pretax gain (loss), not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.

+ References + Details

+ References + Details

Inventories, Net (Schedule Of Inventories, Net) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Inventories, Net [Abstract]
Finished products	$ 357,953	$ 350,685	$ 361,956
Products in process and raw materials	15,751	11,116	12,254
Supplies and expendable parts	54,010	53,287	49,025
Inventories, Gross	427,714	415,088	423,235
Less allowances	(94,227)	(92,481)	(91,556)
Total	$ 333,487	$ 322,607	$ 331,679

- Definition

The amount of the valuation account as of the balance sheet date which reduces the carrying amount of inventory to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage. May also provide for estimated product returns or price concessions pertaining to product cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 6
-Subparagraph a
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 3
-Section A
-Paragraph 9
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 4
-Paragraph 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 4
-Paragraph 8, 9, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 09
-Article 12

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.BB)
-URI http://asc.fasb.org/extlink&oid=6386940&loc=d3e100047-122729

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690

+ Details

- Definition

Carrying amount as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.

+ References + Details

Goodwill And Intangible Assets (Changes In Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2012 USD ($)
Goodwill [Line Items]
Balance at beginning of period	$ 616,671
Adjustments to purchase price allocations	58
Balance at end of period	616,729
Mideast Group [Member]
Goodwill [Line Items]
Balance at beginning of period	122,052
District reorganization	(9,229)
Balance at end of period	112,823
Southeast Group [Member]
Goodwill [Line Items]
Balance at beginning of period	72,073
District reorganization	9,229
Balance at end of period	81,302
West Group [Member]
Goodwill [Line Items]
Balance at beginning of period	422,546
Adjustments to purchase price allocations	58
Balance at end of period	$ 422,604

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph l
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6905597&loc=d3e13816-109267

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Long-Term Debt (Narrative) (Details) - USD ($)				3 Months Ended
Long-Term Debt (Narrative) (Details) - USD ($)	Apr. 13, 2012	Jan. 23, 2012	Jan. 23, 2012	Mar. 31, 2012	Mar. 31, 2011
Debt Instrument [Line Items]
Debt instrument maturity date			2037
Interest rate on notes		6.25%	6.25%
Debt covenant				<div class="MetaData"> <p style="margin-top: 12px; margin-bottom: 0px; margin-left: 5%;" align="justify"><font style="font-family: Times New Roman;" class="_mt" size="3">The Credit Agreement and the AR Credit Facility require the Corporation's ratio of consolidated debt to consolidated earnings before interest, taxes, depreciation, depletion and amortization (EBITDA), as defined, for the trailing twelve month period (the "Ratio") to not exceed <font class="_mt">3.50</font>x as of the end of any fiscal quarter, provided that the Corporation may exclude from the Ratio debt incurred in connection with certain acquisitions for a period of 180 days so long as the Corporation maintains specified ratings on its long-term unsecured debt and the Ratio calculated without such exclusion does not exceed <font class="_mt">3.75</font>x. Additionally, if no amounts are outstanding under both the Revolving Facility and the AR Credit Facility, consolidated debt, including debt guaranteed by the Corporation, may be reduced by the Corporation's unrestricted cash and cash equivalents in excess of $<font class="_mt">50,000,000</font>, such reduction not to exceed $<font class="_mt">200,000,000</font>, for purposes of the covenant calculation. </font></p></div>
Additional interest expense				$ 251,000	$ 234,000
6.25% Senior Notes, Due 2037 [Member]
Debt Instrument [Line Items]
Senior notes debt outstanding repurchased after year end		$ 20,000,000
Percent of par value paid to repurchase senior notes		$ 90.75	$ 90.75
Revolving credit facility borrowings to finance repurchase of senior notes after year end		$ 18,200,000
Debt instrument maturity date				2037
Interest rate on notes				6.25%
6.6% Senior Notes, due 2018
Debt Instrument [Line Items]
Debt instrument maturity date				2018
Interest rate on notes				6.60%
Increase in annual interest expense due to ongoing amortization of the terminated value of the swap agreements				$ 1,000,000
AR Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	April 20, 2013
Including Acquisition Bridge Debt [Member]
Debt Instrument [Line Items]
Debt covenant				3.50
Excluding Acquisition Bridge Debt [Member]
Debt Instrument [Line Items]
Debt covenant				3.75
Maximum [Member]
Debt Instrument [Line Items]
Debt covenant				3.95
Maximum [Member] \| Unrestricted Cash Reduction [Member]
Debt Instrument [Line Items]
Maximum consolidated debt reduction for unrestricted cash and cash equivalents for debt covenant calculation				$ 200,000,000
Minimum [Member] \| Unrestricted Cash Reduction [Member]
Debt Instrument [Line Items]
Reduction of consolidated debt in the debt ratio calculation				$ 50,000,000

Long-Term Debt (Long-Term Debt) (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 23, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Debt Instrument [Line Items]
Total debt		$ 1,134,828	$ 1,060,084	$ 1,168,619
Less current maturities		(7,650)	(7,182)	(7,101)
Long-term debt		1,127,178	1,052,902	1,161,518
Maturity date	2037
Interest rate on notes	6.25%
6.6% Senior Notes, due 2018
Debt Instrument [Line Items]
Total debt		$ 298,525	298,476	298,333
Maturity date		2018
Interest rate on notes		6.60%
7% Debentures, Due 2025 [Member]
Debt Instrument [Line Items]
Total debt		$ 124,424	124,417	124,399
Maturity date		2025
Interest rate on notes		7.00%
6.25% Senior Notes, Due 2037 [Member]
Debt Instrument [Line Items]
Total debt		$ 228,089	247,915	247,890
Maturity date		2037
Interest rate on notes		6.25%
6.875% Notes, due 2011
Debt Instrument [Line Items]
Total debt				242,140
Maturity date		2011
Interest rate on notes		6.875%
Term Loan Facility, Due 2015 [Member]
Debt Instrument [Line Items]
Total debt		$ 245,000	$ 250,000	$ 250,000
Maturity date		2015
Interest rate on term loan		1.87%	2.20%	1.93%
Revolving Facility [Member]
Debt Instrument [Line Items]
Credit Facility		$ 135,000	$ 35,000
Credit Facility interest rate		1.62%	2.64%
AR Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility		$ 100,000	$ 100,000
Credit Facility interest rate		1.60%	1.66%
Other Notes [Member]
Debt Instrument [Line Items]
Other notes		$ 3,790	$ 4,276	$ 5,857

Financial Instruments (Details) - USD ($)	3 Months Ended	12 Months Ended
Financial Instruments (Details) - USD ($)	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Financial Instruments [Abstract]
Percentage of aggregate business net sales in top five sales states		57.00%
Maturities of cash equivalents, in months	three
Carrying values of long-term debt	$ 1,134,828,000	$ 1,060,084,000	$ 1,168,619,000
Fair values of long-term debt	$ 1,129,890,000	$ 1,087,726,000	$ 1,183,716,000

Income Taxes (Schedule Of Estimated Effective Income Tax Rate) (Details)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Income Taxes [Abstract]
Continuing operations	21.00%	27.30%
Discontinued operations	14.60%	16.40%
Consolidated overall	20.90%	26.60%

Income Taxes (Details)	3 Months Ended
Income Taxes (Details)	Mar. 31, 2012 USD ($)
Income Taxes [Abstract]
Unrecognized tax benefits at beginning of period	$ 9,288,000
Gross increases - tax positions in prior years	9,366,000
Gross decreases - tax positions in prior years	(13,876,000)
Gross increases - tax positions in current year	452,000
Settlements with taxing authorities	(554,000)
Unrecognized tax benefits at end of period	4,676,000
Unrecognized tax benefits that would impact effective tax rate	$ 5,472,000

Pension And Postretirement Benefits (Schedule Of Components Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3,600	$ 2,973
Interest cost	5,941	5,862
Expected return on assets	(5,970)	(6,051)
Prior service cost (credit)	122	133
Actuarial loss (gain)	3,321	1,866
Settlement charge		14
Net periodic benefit cost (credit)	7,014	4,797
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	66	124
Interest cost	315	614
Prior service cost (credit)	(814)	(435)
Actuarial loss (gain)	(64)
Settlement charge
Net periodic benefit cost (credit)	$ (497)	$ 303

Commitments And Contingencies (Details)	3 Months Ended
Commitments And Contingencies (Details)	Mar. 31, 2012 USD ($)
Revolving Line Of Credit Expires In July 2013 [Member]
Guarantor Obligations [Line Items]
Guarantee of affiliate's obligations	$ 24,000,000
Line of credit maturity period	July 2013
Loan Due April 2016 [Member]
Guarantor Obligations [Line Items]
Guarantee of affiliate's obligations	$ 6,200,000
Loan due date	April 2016

Business Segments (Financial Data For Continuing Operations For The Corporation's Reportable Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting Information [Line Items]
Total revenues, Total	$ 393,979	$ 327,943
Net sales, Total	350,537	290,636
(Loss) Earnings from operations, Total	(35,324)	(4,448)
Total Aggregates Business [Member]
Segment Reporting Information [Line Items]
Total revenues, Total	337,676	274,345
Net sales, Total	298,821	241,495
(Loss) Earnings from operations, Total	(23,453)	(14,818)
Specialty Products [Member]
Segment Reporting Information [Line Items]
Total revenues, Total	56,303	53,598
Net sales, Total	51,716	49,141
(Loss) Earnings from operations, Total	18,221	15,129
Mideast Group [Member]
Segment Reporting Information [Line Items]
Total revenues, Total	84,444	76,080
Net sales, Total	77,184	71,340
(Loss) Earnings from operations, Total	(850)	2,052
Southeast Group [Member]
Segment Reporting Information [Line Items]
Total revenues, Total	73,512	67,579
Net sales, Total	67,526	62,709
(Loss) Earnings from operations, Total	(3,728)	(4,197)
West Group [Member]
Segment Reporting Information [Line Items]
Total revenues, Total	179,720	130,686
Net sales, Total	154,111	107,446
(Loss) Earnings from operations, Total	(18,875)	(12,673)
Corporate [Member]
Segment Reporting Information [Line Items]
(Loss) Earnings from operations, Total	$ (30,092)	$ (4,759)

Business Segments (Net Sales By Product Line) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenue from External Customer [Line Items]
Net sales, Total	$ 350,537	$ 290,636
Aggregates [Member]
Revenue from External Customer [Line Items]
Net sales, Total	256,976	222,983
Asphalt [Member]
Revenue from External Customer [Line Items]
Net sales, Total	12,542	10,976
Ready Mixed Concrete [Member]
Revenue from External Customer [Line Items]
Net sales, Total	20,301	5,314
Road Paving [Member]
Revenue from External Customer [Line Items]
Net sales, Total	8,676	2,222
Other [Member]
Revenue from External Customer [Line Items]
Net sales, Total	326
Total Aggregates Business [Member]
Revenue from External Customer [Line Items]
Net sales, Total	298,821	241,495
Magnesia-Based Chemicals [Member]
Revenue from External Customer [Line Items]
Net sales, Total	36,398	35,159
Dolomitic Lime [Member]
Revenue from External Customer [Line Items]
Net sales, Total	14,973	13,780
Other [Member]
Revenue from External Customer [Line Items]
Net sales, Total	345	202
Specialty Products [Member]
Revenue from External Customer [Line Items]
Net sales, Total	$ 51,716	$ 49,141

Supplemental Cash Flow Information (Components Of Change In Other Assets And Liabilities, Net) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Supplemental Cash Flow Information [Abstract]
Other current and noncurrent assets	$ (2,797)	$ (668)
Accrued salaries, benefits and payroll taxes	(3,517)	(7,129)
Accrued insurance and other taxes	(2,383)	790
Accrued income taxes	(5,306)	(10,610)
Accrued pension, postretirement and postemployment benefits	1,903	1,686
Other current and noncurrent liabilities	10,470	12,803
Other assets and liabilities, net	$ (1,630)	$ (3,128)