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Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contract receivables $ 55,125 $ 43,218
Allowance for doubtful accounts (920) (699)
Accounts receivable, Total 65,767 58,394
Trade Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables $ 11,562 $ 15,875