Accounts Payable and Accrued Expenses - Summary of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Payables And Accruals [Abstract]
Trade accounts payable, including due to subcontractors	$ 54,375	$ 58,985
Compensation and related benefits	5,747	8,232
Current portion of earn-out liability	6,970	13,527	$ 18,247
Accrued warranty	4,482	2,684
Other accrued expenses	10,018	12,182
Accounts payable and accrued expenses	$ 81,592	$ 95,610