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Costs and Estimated Earnings on Uncompleted Contracts - Costs and Estimated Earnings on Uncompleted Contracts (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Costs In Excess Of Billings On Uncompleted Contracts Or Programs [Abstract]    
Costs incurred on uncompleted contracts $ 220,631 $ 174,168
Estimated earnings 83,186 67,427
Total costs and estimated earnings on uncompleted contracts, gross 303,817 241,595
Less billings to date (292,421) (232,045)
Total costs and estimated earnings on uncompleted contracts, net 11,396 9,550
Included in the accompanying condensed consolidated balance sheets under the following captions:    
Costs and estimated earnings in excess of billings on uncompleted contracts 34,409 29,694
Billings in excess of costs and estimated earnings on uncompleted contracts (23,013) (20,144)
Total costs and estimated earnings on uncompleted contracts, net $ 11,396 $ 9,550