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Costs and Estimated Earnings on Uncompleted Contracts - Costs and Estimated Earnings on Uncompleted Contracts (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Costs in Excess of Billings on Uncompleted Contracts or Programs [Abstract]    
Costs incurred on uncompleted contracts $ 206,968 $ 97,979
Estimated earnings 70,207 28,328
Contract Revenues 277,175 126,307
Less billings to date (241,830) (116,533)
Net bills receivable 35,345 9,774
Included in the accompanying condensed consolidated balance sheets under the following captions:    
Costs and estimated earnings in excess of billings on uncompleted contracts 58,686 24,371
Billings in excess of costs and estimated earnings on uncompleted contracts (23,341) (14,597)
Net bills receivable $ 35,345 $ 9,774