Net Sales By Product Line (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Business Combination, Separately Recognized Transactions
Net Sales	$ 600,457	$ 537,507	$ 1,451,848	$ 1,376,944
Gross profit (loss)	143,108	124,022	262,925	250,412
Aggregates
Business Combination, Separately Recognized Transactions
Net Sales	411,206	371,398	1,016,238	985,563
Gross profit (loss)	108,166	94,541	189,171	182,883
Asphalt
Business Combination, Separately Recognized Transactions
Net Sales	23,787	28,881	52,231	61,655
Gross profit (loss)	7,322	6,359	9,770	9,065
Ready Mixed Concrete
Business Combination, Separately Recognized Transactions
Net Sales	41,765	31,531	103,347	78,746
Gross profit (loss)	3,124	472	4,911	421
Road Paving
Business Combination, Separately Recognized Transactions
Net Sales	67,905	56,250	112,437	99,354
Gross profit (loss)	4,286	2,276	(285)	208
Total Aggregates Business
Business Combination, Separately Recognized Transactions
Net Sales	544,663	488,060	1,284,253	1,225,318
Gross profit (loss)	122,898	103,648	203,567	192,577
Specialty Products
Business Combination, Separately Recognized Transactions
Net Sales	55,794	49,447	167,595	151,626
Gross profit (loss)	19,919	19,744	60,784	59,057
Corporate
Business Combination, Separately Recognized Transactions
Gross profit (loss)	$ 291	$ 630	$ (1,426)	$ (1,222)