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Schedule of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Receivables [Abstract]    
Billed and billable $ 129,034 $ 169,554
Less: allowance for doubtful accounts (3,919) (4,190)
Accounts receivable, net $ 125,115 $ 165,364