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Provision for Doubtful Accounts - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Provisions for Doubtful Accounts [Line Items]        
Provision for doubtful accounts $ 2,900 $ 2,400 $ 10,404 $ 9,387