CONSOLIDATED STATEMENTS OF EARNINGS AND COMPREHENSIVE EARNINGS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net Sales	$ 539,140	$ 445,003	$ 1,380,897	$ 1,145,204
Freight and delivery revenues	54,761	57,383	152,699	147,516
Total revenues	593,901	502,386	1,533,596	1,292,720
Cost of sales	415,556	333,110	1,131,395	913,112
Freight and delivery costs	54,761	57,383	152,699	147,516
Total cost of revenues	470,317	390,493	1,284,094	1,060,628
Gross Profit	123,584	111,893	249,502	232,092
Selling, general & administrative expenses	32,095	32,774	100,398	92,415
Business development costs		733	35,140	3,441
Other operating expenses and (income), net	394	(1,625)	(1,070)	(4,028)
Earnings from Operations	91,095	80,011	115,034	140,264
Interest expense	13,224	13,398	39,967	45,288
Other nonoperating expenses and (income), net	620	2,147	(1,277)	2,221
Earnings from continuing operations before taxes on income	77,251	64,466	76,344	92,755
Income tax expense	13,464	14,130	12,146	21,853
Earnings from Continuing Operations	63,787	50,336	64,198	70,902
Loss on discontinued operations, net of related tax benefit of $134, $618, $209 and $1,652, respectively	(118)	(4)	(395)	(2,412)
Consolidated net earnings	63,669	50,332	63,803	68,490
Less: Net earnings attributable to noncontrolling interests	747	1,176	863	949
Net Earnings Attributable to Martin Marietta Materials, Inc.	62,922	49,156	62,940	67,541
Net Earnings (Loss) Attributable to Martin Marietta Materials, Inc.
Earnings from continuing operations	63,040	49,160	63,335	69,953
Loss from discontinued operations	(118)	(4)	(395)	(2,412)
Net Earnings Attributable to Martin Marietta Materials, Inc.	62,922	49,156	62,940	67,541
Consolidated Comprehensive Earnings (See Note 1)
Earnings attributable to Martin Marietta Materials, Inc.	66,082	48,916	69,350	71,641
Earnings attributable to noncontrolling interests	750	1,177	873	952
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 66,832	$ 50,093	$ 70,223	$ 72,593
Net Earnings (Loss) Attributable to Martin Marietta Materials, Inc.Per Common Share
Basic from continuing operations attributable to common shareholders	$ 1.36	$ 1.07	$ 1.38	$ 1.52
Discontinued operations attributable to common shareholders			$ (0.01)	$ (0.05)
Earnings Per Share, Basic, Total	$ 1.36	$ 1.07	$ 1.37	$ 1.47
Diluted from continuing operations attributable to common shareholders	$ 1.36	$ 1.07	$ 1.37	$ 1.51
Discontinued operations attributable to common shareholders			$ (0.01)	$ (0.05)
Earnings Per Share, Diluted, Total	$ 1.36	$ 1.07	$ 1.36	$ 1.46
Weighted-Average Common Shares Outstanding
Basic	45,860	45,690	45,792	45,634
Diluted	45,992	45,799	45,929	45,783
Cash Dividends Per Common Share	$ 0.40	$ 0.40	$ 1.20	$ 1.20