Consolidated Statements Of Earnings (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements Of Earnings
Net Sales	$ 463,985	$ 443,709	$ 1,196,931	$ 1,182,054
Freight and delivery revenues	70,771	65,692	187,284	172,920
Total revenues	534,756	509,401	1,384,215	1,354,974
Cost of sales	352,520	329,900	967,873	930,906
Freight and delivery costs	70,771	65,692	187,284	172,920
Total cost of revenues	423,291	395,592	1,155,157	1,103,826
Gross Profit	111,465	113,809	229,058	251,148
Selling, general & administrative expenses	33,487	31,235	94,386	98,365
Research and development		114	2	149
Other operating (income) and expenses, net	(1,021)	(1,394)	(1,213)	(9,030)
Earnings from Operations	78,999	83,854	135,883	161,664
Interest expense	13,394	17,104	45,284	51,540
Other nonoperating (income) and expenses, net	2,146	(545)	2,220	189
Earnings from continuing operations before taxes on income	63,459	67,295	88,379	109,935
Income tax expense	13,374	14,061	20,080	26,615
Earnings from Continuing Operations	50,085	53,234	68,299	83,320
Gain on discontinued operations, net of related tax expense (benefit) of $138, ($37), $121 and $12, respectively	247	22	191	135
Consolidated net earnings	50,332	53,256	68,490	83,455
Less: Net earnings attributable to noncontrolling interests	1,176	1,266	949	1,246
Net Earnings Attributable to Martin Marietta Materials, Inc.	49,156	51,990	67,541	82,209
Net Earnings Attributable to Martin Marietta Materials, Inc.
Earnings from continuing operations	48,909	51,968	67,350	82,074
Earnings from discontinued operations	247	22	191	135
Net Earnings Attributable to Martin Marietta Materials, Inc.	$ 49,156	$ 51,990	$ 67,541	$ 82,209
Net Earnings Attributable to Martin Marietta Materials, Inc. Per Common Share
Basic from continuing operations attributable to common shareholders	$ 1.07	$ 1.13	$ 1.47	$ 1.79
Discontinued operations attributable to common shareholders
Basic net earnings available to common shareholders	$ 1.07	$ 1.13	$ 1.47	$ 1.79
Diluted from continuing operations attributable to common shareholders	$ 1.07	$ 1.13	$ 1.46	$ 1.78
Discontinued operations attributable to common shareholders
Diluted net earnings available to common shareholders	$ 1.07	$ 1.13	$ 1.46	$ 1.78
Weighted-Average Common Shares Outstanding
Basic	45,690	45,526	45,634	45,463
Diluted	45,799	45,678	45,783	45,639
Cash Dividends Per Common Share	$ 0.40	$ 0.40	$ 1.20	$ 1.20