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Allowance for Doubtful Accounts and Unbilled Services - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Provisions for Doubtful Accounts [Line Items]        
Provision for doubtful accounts $ 4,200 $ 3,400 $ 8,671 $ 7,478