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Costs, Estimated Earnings, and Related Billings on Uncompleted Contracts - Schedule of Costs, Estimated Earnings, and Related Billing on Uncompleted Contracts (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Contractors [Abstract]    
Cost and estimated earnings in excess of billings on uncompleted contracts $ 5,829 $ 2,302
Billings in excess of costs and estimated earnings on uncompleted contracts (208) (1,629)
Total Costs, estimated earnings, and related billing on uncompleted contracts $ 5,621 $ 673