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Costs and Estimated Earnings on Uncompleted Contracts - Costs and Estimated Earnings on Uncompleted Contracts (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Costs In Excess Of Billings On Uncompleted Contracts Or Programs [Abstract]    
Costs incurred on uncompleted contracts $ 184,321 $ 174,168
Estimated earnings 77,326 67,427
Total costs and estimated earnings on uncompleted contracts, gross 261,647 241,595
Less billings to date (261,211) (232,045)
Total costs and estimated earnings on uncompleted contracts, net 436 9,550
Included in the accompanying consolidated balance sheets under the following captions:    
Costs and estimated earnings in excess of billings on uncompleted contracts 34,805 29,694
Billings in excess of costs and estimated earnings on uncompleted contracts (34,369) (20,144)
Total costs and estimated earnings on uncompleted contracts, net $ 436 $ 9,550