Consolidated Statements Of Earnings (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Consolidated Statements Of Earnings
Net Sales	$ 426,707	$ 442,784	$ 732,951	$ 738,345
Freight and delivery revenues	66,245	61,846	116,513	107,229
Total revenues	492,952	504,630	849,464	845,574
Cost of sales	330,256	325,084	615,389	601,029
Freight and delivery costs	66,245	61,846	116,513	107,229
Total cost of revenues	396,501	386,930	731,902	708,258
Gross Profit	96,451	117,700	117,562	137,316
Selling, general & administrative expenses	31,664	33,559	60,899	67,130
Research and development		22	2	36
Other operating (income) and expenses, net	1,792	(6,531)	(192)	(7,638)
Earnings from Operations	62,995	90,650	56,853	77,788
Interest expense	13,725	16,820	31,890	34,436
Other nonoperating (income) and expenses, net	336	1,334	74	733
Earnings from continuing operations before taxes on income	48,934	72,496	24,889	42,619
Income tax expense	13,084	17,535	6,700	12,551
Earnings from Continuing Operations	35,850	54,961	18,189	30,068
Gain (Loss) on discontinued operations, net of related tax expense (nemefit) of $1, $14, ($11) and $52, respectively	4	(13)	(31)	132
Consolidated net earnings	35,854	54,948	18,158	30,200
Less: Net earnings (loss) attributable to noncontrolling interests	55	549	(227)	(20)
Net Earnings Attributable to Martin Marietta Materials, Inc.	35,799	54,399	18,385	30,220
Net Earnings Attributable to Martin Marietta Materials, Inc.
Earnings from continuing operations	35,795	54,412	18,416	30,088
Earnings (Loss) from discontinued operations	4	(13)	(31)	132
Net Earnings Attributable to Martin Marietta Materials, Inc.	$ 35,799	$ 54,399	$ 18,385	$ 30,220
Net Earnings Attributable to Martin Marietta Materials, Inc. Per Common Share
Basic from continuing operations attributable to common shareholders	$ 0.78	$ 1.18	$ 0.40	$ 0.66
Discontinued operations attributable to common shareholders
Basic net earnings available to common shareholders	$ 0.78	$ 1.18	$ 0.40	$ 0.66
Diluted from continuing operations attributable to common shareholders	$ 0.78	$ 1.18	$ 0.39	$ 0.65
Discontinued operations attributable to common shareholders
Diluted net earnings available to common shareholders	$ 0.78	$ 1.18	$ 0.39	$ 0.65
Weighted-Average Common Shares Outstanding
Basic	45,628	45,463	45,606	45,431
Diluted	45,794	45,657	45,774	45,619
Cash Dividends Per Common Share	$ 0.40	$ 0.40	$ 0.80	$ 0.80