Business Acquisition - Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	5 Months Ended
	Dec. 31, 2015	Aug. 05, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill	$ 65,982		$ 33,798	$ 33,798
TAS Commercial Concrete
Business Acquisition [Line Items]
Accounts receivable		$ 54,987
Costs and estimated earnings in excess of billings on uncompleted contracts		4,372
Prepaid expenses and other current assets		828
Fixed assets, net		15,720
Investment in GLM Concrete Services, LLC		76
Goodwill		33,817
Other intangible assets		33,650
Accounts payable		(18,458)
Accrued expenses and other current liabilities		(13,015)
Total Acquisition Consideration at August 5, 2015	110,344	111,977
Working Capital Adjustment	(1,633)
Total Acquisition Consideration, Final	$ 110,344	$ 111,977