Net Sales By Product Line (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Business Combination, Separately Recognized Transactions
Net Sales	$ 917,942	$ 600,457	$ 1,899,557	$ 1,451,848
Gross profit (loss)	195,593	143,108	357,030	262,925
Aggregates
Business Combination, Separately Recognized Transactions
Net Sales	478,834	411,206	1,164,692	1,016,238
Gross profit (loss)	119,277	108,166	229,471	189,171
Asphalt
Business Combination, Separately Recognized Transactions
Net Sales	26,873	23,787	59,998	52,231
Gross profit (loss)	7,356	7,322	10,799	9,770
Ready Mixed Concrete
Business Combination, Separately Recognized Transactions
Net Sales	183,715	41,765	274,103	103,347
Gross profit (loss)	18,628	3,124	28,554	4,911
Road Paving
Business Combination, Separately Recognized Transactions
Net Sales	60,327	67,905	113,302	112,437
Gross profit (loss)	6,897	4,286	2,665	(285)
Total Aggregates Business
Business Combination, Separately Recognized Transactions
Net Sales	749,749	544,663	1,612,095	1,284,253
Gross profit (loss)	152,158	122,898	271,489	203,567
Cement
Business Combination, Separately Recognized Transactions
Net Sales	109,521		109,521
Gross profit (loss)	24,194		24,194
Specialty Products
Business Combination, Separately Recognized Transactions
Net Sales	58,672	55,794	177,941	167,595
Gross profit (loss)	20,043	19,919	62,192	60,784
Corporate
Business Combination, Separately Recognized Transactions
Gross profit (loss)	$ (802)	$ 291	$ (845)	$ (1,426)