Costs and Estimated Earnings on Uncompleted Contracts - Costs and Estimated Earnings on Uncompleted Contracts (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Costs In Excess Of Billings On Uncompleted Contracts Or Programs [Abstract]
Costs incurred on uncompleted contracts	$ 65,636	$ 61,416
Estimated earnings	21,036	21,505
Contract Revenues	86,672	82,921
Less billings to date	(82,776)	(85,297)
Net bills receivable	3,896	(2,376)
Included in the accompanying consolidated balance sheets under the following captions:
Costs and estimated earnings in excess of billings on uncompleted contracts	15,215	11,110
Billings in excess of costs and estimated earnings on uncompleted contracts	(11,319)	(13,486)
Net bills receivable	$ 3,896	$ (2,376)