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Costs and Estimated Earnings on Uncompleted Contracts - Costs and Estimated Earnings on Uncompleted Contracts (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Costs In Excess Of Billings On Uncompleted Contracts Or Programs [Abstract]    
Costs incurred on uncompleted contracts $ 174,168 $ 169,665
Estimated earnings 67,427 61,556
Total costs and estimated earnings on uncompleted contracts, gross 241,595 231,221
Less billings to date (232,045) (217,743)
Total costs and estimated earnings on uncompleted contracts, net 9,550 13,478
Included in the accompanying consolidated balance sheets under the following captions:    
Costs and estimated earnings in excess of billings on uncompleted contracts 29,694 33,947
Billings in excess of costs and estimated earnings on uncompleted contracts (20,144) (20,469)
Total costs and estimated earnings on uncompleted contracts, net $ 9,550 $ 13,478