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Accounts Receivable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed and billable $ 139,099 $ 175,382
Less: unpaid deferred revenue (78,232) (103,403)
Accounts receivable, gross 60,867 71,979
Less: allowance for doubtful accounts (4,309) (3,825)
Accounts receivable, net $ 56,558 $ 68,154