Net Sales By Product Line (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
Business Combination, Separately Recognized Transactions
Net Sales	$ 601,937	$ 507,332	$ 981,615	$ 851,390
Gross profit (loss)	135,602	106,996	161,438	119,817
Aggregates
Business Combination, Separately Recognized Transactions
Net Sales	421,974	357,241	685,858	605,031
Gross profit (loss)	100,142	78,942	110,194	81,003
Asphalt
Business Combination, Separately Recognized Transactions
Net Sales	22,627	18,811	33,125	28,445
Gross profit (loss)	4,869	4,903	3,443	2,448
Ready Mixed Concrete
Business Combination, Separately Recognized Transactions
Net Sales	52,379	35,305	90,388	61,582
Gross profit (loss)	6,982	1,869	9,926	1,788
Road Paving
Business Combination, Separately Recognized Transactions
Net Sales	43,037	39,343	52,975	44,531
Gross profit (loss)	(249)	(284)	(4,231)	(4,571)
Total Aggregates Business
Business Combination, Separately Recognized Transactions
Net Sales	540,017	450,700	862,346	739,589
Gross profit (loss)	111,744	85,430	119,332	80,668
Specialty Products
Business Combination, Separately Recognized Transactions
Net Sales	61,920	56,632	119,269	111,801
Gross profit (loss)	23,394	21,284	42,149	40,866
Corporate
Business Combination, Separately Recognized Transactions
Gross profit (loss)	$ 464	$ 282	$ (43)	$ (1,717)