Costs and Estimated Earnings on Uncompleted Contracts - Costs and Estimated Earnings on Uncompleted Contracts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Costs In Excess Of Billings On Uncompleted Contracts Or Programs [Abstract]
Costs incurred on uncompleted contracts	$ 178,356	$ 97,848
Estimated earnings	64,957	28,328
Contract Revenues	243,313	126,176
Less billings to date	(228,138)	(116,533)
Net bills receivable	15,175	9,643
Included in the accompanying consolidated balance sheets under the following captions:
Costs and estimated earnings in excess of billings on uncompleted contracts	43,175	24,371
Billings in excess of costs and estimated earnings on uncompleted contracts	(28,000)	(14,728)
Net bills receivable	$ 15,175	$ 9,643