Business Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	5 Months Ended
	Dec. 31, 2015	Mar. 31, 2016	Aug. 05, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 65,982	$ 65,982		$ 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			$ 111,977
Working Capital Adjustment	(1,633)
Total Acquisition Consideration	$ 110,344