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Schedule of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Receivables [Abstract]    
Billed and billable $ 148,529 $ 188,038
Less: unpaid deferred revenue (75,898) (101,538)
Accounts receivable, gross 72,631 86,500
Less: allowance for doubtful accounts (4,626) (3,181)
Accounts receivable, net $ 68,005 $ 83,319