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Accounts Receivable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed and billable $ 115,389 $ 187,470
Less: unpaid deferred revenue (56,599) (104,425)
Accounts receivable, gross 58,790 83,045
Less: allowance for doubtful accounts (3,751) (4,412)
Accounts receivable, net $ 55,039 $ 78,633