Equity Method Investments (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Summarized Statement of Operations Information of Brand:
Equity Method Investment, Summarized Financial Information, Revenue		$ 750,394		$ 1,551,146
Gross profit		148,972		329,549
Net income (loss) attributable to Brand Energy & Infrastructure Services, Inc. and Subsidiaries		(2,682)		8,378
Equity income (loss) of unconsolidated entities, net	$ 0	(694)	$ 0	2,481
Infrastructure Transaction Strategic Venture
Summarized Statement of Operations Information of Brand:
Equity income (loss) of unconsolidated entities, net		$ (694)		$ 2,481