CONSOLIDATED STATEMENTS OF EARNINGS AND COMPREHENSIVE EARNINGS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net Sales	$ 491,220	$ 409,565	$ 841,757	$ 700,201
Freight and delivery revenues	54,497	52,826	97,938	90,133
Total revenues	545,717	462,391	939,695	790,334
Cost of sales	389,132	312,022	715,839	580,002
Freight and delivery costs	54,497	52,826	97,938	90,133
Total cost of revenues	443,629	364,848	813,777	670,135
Gross Profit	102,088	97,543	125,918	120,199
Selling, general & administrative expenses	35,275	31,001	68,303	59,641
Business development costs	9,240	1,735	35,140	2,707
Other operating (income) and expenses, net	(1,690)	106	(1,465)	(2,402)
Earnings from Operations	59,263	64,701	23,940	60,253
Interest expense	13,256	13,725	26,743	31,890
Other nonoperating (income) and expenses, net	(42)	336	(1,897)	74
Earnings (Loss) from continuing operations before taxes on income	46,049	50,640	(906)	28,289
Income tax expense (benefit)	8,557	13,834	(1,318)	7,723
Earnings from Continuing Operations	37,492	36,806	412	20,566
Gain (Loss) on discontinued operations, net of related tax expense (benefit) of $26, ($749), ($75) and ($1, 034), respectively	316	(952)	(278)	(2,408)
Consolidated net earnings	37,808	35,854	134	18,158
Less: Net earnings (loss) attributable to noncontrolling interests	1,057	55	116	(227)
Net Earnings Attributable to Martin Marietta Materials, Inc.	36,751	35,799	18	18,385
Net Earnings Attributable to Martin Marietta Materials, Inc.
Earnings from continuing operations	36,435	36,751	296	20,793
Earnings (Loss) from discontinued operations	316	(952)	(278)	(2,408)
Net Earnings Attributable to Martin Marietta Materials, Inc.	36,751	35,799	18	18,385
Consolidated Comprehensive Earnings
Earnings attributable to Martin Marietta Materials, Inc.	38,102	41,045	3,268	22,726
Earnings (Loss) attributable to noncontrolling interests	1,060	56	122	(225)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 39,162	$ 41,101	$ 3,390	$ 22,501
Net Earnings (Loss) Attributable to Martin Marietta Materials, Inc.Per Common Share
Basic from continuing operations attributable to common shareholders	$ 0.79	$ 0.80		$ 0.45
Discontinued operations attributable to common shareholders	$ 0.01	$ (0.02)		$ (0.05)
Earnings Per Share, Basic, Total	$ 0.80	$ 0.78		$ 0.40
Diluted from continuing operations attributable to common shareholders	$ 0.79	$ 0.80		$ 0.44
Discontinued operations attributable to common shareholders	$ 0.01	$ (0.02)		$ (0.05)
Earnings Per Share, Diluted, Total	$ 0.80	$ 0.78		$ 0.39
Weighted-Average Common Shares Outstanding
Basic	45,781	45,628	45,757	45,606
Diluted	45,905	45,794	45,757	45,774
Cash Dividends Per Common Share	$ 0.40	$ 0.40	$ 0.80	$ 0.80