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Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contract receivables $ 72,641 $ 86,129
Allowance for doubtful accounts (1,350) (1,151)
Accounts receivable, Total 83,359 97,778
Trade Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables $ 12,068 $ 12,800