Comprehensive Earnings Attributable to Martin Marietta Materials Incorporated (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Comprehensive Income (Loss)
Net earnings attributable to Martin Marietta Materials, Inc.	$ 59,521	$ 41,308	$ 37,904	$ 13,468
Other comprehensive earnings (loss), net of tax	603	(1,309)	1,973	(88)
Comprehensive earnings attributable to Martin Marietta Materials, Inc.	$ 60,124	$ 39,999	$ 39,877	$ 13,380