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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, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Provisions for Doubtful Accounts [Line Items]        
Provision for doubtful accounts $ 2,400 $ 3,700 $ 9,387 $ 9,483