Consolidated Statements of Earnings and Comprehensive Earnings (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Total Revenues	$ 1,279,468	$ 1,202,403	$ 2,218,423	$ 2,004,407
Total Cost of Revenues	922,601	886,486	1,718,649	1,578,098
Gross Profit	356,867	315,917	499,774	426,309
Selling, general & administrative expenses	72,382	71,070	150,674	141,191
Acquisition-related expenses, net	47	12,126	191	12,836
Other operating income, net	(1,444)	(31,232)	(6,194)	(30,752)
Earnings from Operations	285,882	263,953	355,103	303,034
Interest expense	33,297	32,971	66,245	68,059
Other nonoperating expense and (income), net	13,226	(7,122)	11,663	(15,626)
Earnings before income tax expense	239,359	238,104	277,195	250,601
Income tax expense	49,890	52,601	44,899	55,058
Consolidated net earnings	189,469	185,503	232,296	195,543
Less: Net (loss) earnings attributable to noncontrolling interests	(6)	126	(32)	143
Net Earnings Attributable to Martin Marietta Materials, Inc.	189,475	185,377	232,328	195,400
Consolidated Comprehensive Earnings:
Earnings attributable to Martin Marietta Materials, Inc.	192,465	186,979	238,573	198,621
(Loss) Earnings attributable to noncontrolling interests	(5)	126	(32)	144
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 192,460	$ 187,105	$ 238,541	$ 198,765
Net Earnings Attributable to Martin Marietta Materials, Inc. Per Common Share:
Basic attributable to common shareholders	$ 3.02	$ 2.94	$ 3.71	$ 3.10
Diluted attributable to common shareholders	$ 3.01	$ 2.92	$ 3.69	$ 3.08
Weighted-Average Common Shares Outstanding:
Basic	62,563	63,021	62,574	62,989
Diluted	62,720	63,285	62,749	63,253
Products and Services
Total Revenues	$ 1,196,135	$ 1,128,777	$ 2,074,440	$ 1,882,082
Total Cost of Revenues	838,322	812,430	1,572,490	1,454,049
Freight
Total Revenues	83,333	73,626	143,983	122,325
Total Cost of Revenues	$ 84,279	$ 74,056	$ 146,159	$ 124,049