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Costs and Estimated Earnings on Uncompleted Contracts - Costs and Estimated Earnings on Uncompleted Contracts (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Costs In Excess Of Billings On Uncompleted Contracts Or Programs [Abstract]    
Costs incurred on uncompleted contracts $ 178,217 $ 178,356
Estimated earnings 62,064 64,957
Contract Revenues 240,281 243,313
Less billings to date (224,160) (228,138)
Net bills receivable 16,121 15,175
Included in the accompanying condensed consolidated balance sheets under the following captions:    
Costs and estimated earnings in excess of billings on uncompleted contracts 44,156 43,175
Billings in excess of costs and estimated earnings on uncompleted contracts 28,035 28,000
Net bills receivable $ 16,121 $ 15,175