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Costs and Estimated Earnings on Uncompleted Contracts - Costs and Estimated Earnings on Uncompleted Contracts (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Costs in Excess of Billings on Uncompleted Contracts or Programs [Abstract]    
Costs incurred on uncompleted contracts $ 74,508 $ 61,416
Estimated earnings 25,228 21,505
Contract Revenues 99,736 82,921
Less billings to date (98,549) (85,297)
Net bills receivable 1,187 (2,376)
Included in the accompanying condensed consolidated balance sheets under the following captions:    
Costs and estimated earnings in excess of billings on uncompleted contracts 13,999 11,110
Billings in excess of costs and estimated earnings on uncompleted contracts (12,812) (13,486)
Net bills receivable $ 1,187 $ (2,376)