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Provision For Doubtful Accounts - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Provisions for Doubtful Accounts [Line Items]        
Provision for doubtful accounts $ 2,500 $ 3,200 $ 7,027 $ 5,768