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Accounts Receivable and Contracts in Progress - Schedule of Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Contract receivables:    
Contracts in progress $ 87,859  
Unbilled retentions 33,099  
Trade receivables 18,846 21,456
Other receivables 328  
Allowance for doubtful accounts (2,089) (2,476)
Total accounts receivable $ 138,043 $ 18,980