Net Sales and Gross Profit by Line of Business (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Product Information [Line Items]
Net Sales	$ 733,960	$ 631,876
Gross profit (loss), Total	144,634	74,261
Corporate
Product Information [Line Items]
Gross profit (loss), Total	(3,898)	(3,629)
Aggregates
Product Information [Line Items]
Net Sales	406,439	332,214
Gross profit (loss), Total	81,083	41,417
Asphalt
Product Information [Line Items]
Net Sales	3,875	9,645
Gross profit (loss), Total	(2,269)	(1,463)
Ready Mixed Concrete
Product Information [Line Items]
Net Sales	186,785	127,572
Gross profit (loss), Total	18,086	2,084
Road Paving
Product Information [Line Items]
Net Sales	7,483	7,126
Gross profit (loss), Total	(3,894)	(3,311)
Aggregates Business
Product Information [Line Items]
Net Sales	604,582	476,557
Gross profit (loss), Total	93,006	38,727
Cement
Product Information [Line Items]
Net Sales	69,873	96,565
Gross profit (loss), Total	32,556	18,985
Magnesia Specialties
Product Information [Line Items]
Net Sales	59,505	58,754
Gross profit (loss), Total	$ 22,970	$ 20,178