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Accounts Receivable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Receivables [Abstract]    
Billed and billable $ 124,392 $ 175,382
Less: unpaid deferred revenue (61,932) (103,403)
Accounts receivable, gross 62,460 71,979
Less: allowance for doubtful accounts (4,408) (3,825)
Accounts receivable, net $ 58,052 $ 68,154