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Schedule of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Receivables [Abstract]    
Billed and billable $ 169,554 $ 188,038
Less: unpaid deferred revenue (95,864) (101,538)
Accounts receivable, gross 73,690 86,500
Less: allowance for doubtful accounts (4,190) (3,181)
Accounts receivable, net $ 69,500 $ 83,319