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Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contract receivables $ 60,176 $ 72,835
Allowance for doubtful accounts (2,883) (1,749)
Accounts receivable, Total 70,504 83,062
Trade Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables $ 13,211 $ 11,976