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Allowance for Doubtful Accounts and Unbilled Services - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Provisions for Doubtful Accounts [Line Items]        
Provision for doubtful accounts $ 3,200 $ 2,900 $ 11,896 $ 10,404