Net Sales and Gross Profit by Line of Business (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Product Information [Line Items]
Net Sales	$ 915,436	$ 850,249	$ 1,649,396	$ 1,482,124
Gross profit (loss), Total	246,701	200,153	391,335	274,414
Corporate
Product Information [Line Items]
Gross profit (loss), Total	(1,515)	(5,989)	(5,411)	(9,618)
Aggregates
Product Information [Line Items]
Net Sales	516,283	481,616	922,721	813,830
Gross profit (loss), Total	164,353	137,272	245,431	178,690
Asphalt and Paving
Product Information [Line Items]
Net Sales	65,609	58,021	76,967	74,790
Gross profit (loss), Total	12,876	7,891	6,714	3,116
Ready Mixed Concrete
Product Information [Line Items]
Net Sales	214,887	149,750	401,673	277,323
Gross profit (loss), Total	25,293	9,341	43,380	11,424
Aggregates Business
Product Information [Line Items]
Net Sales	796,779	689,387	1,401,361	1,165,943
Gross profit (loss), Total	202,522	154,504	295,525	193,230
Cement
Product Information [Line Items]
Net Sales	59,791	100,405	129,664	196,970
Gross profit (loss), Total	24,002	30,414	56,559	49,400
Magnesia Specialties
Product Information [Line Items]
Net Sales	58,866	60,457	118,371	119,211
Gross profit (loss), Total	$ 21,692	$ 21,224	$ 44,662	$ 41,402