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Allowance for Doubtful Accounts and Unbilled Services - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Provisions for Doubtful Accounts [Line Items]        
Provision for doubtful accounts $ 3,800 $ 3,200 $ 10,364 $ 11,896