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Goodwill and Intangible Assets - 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
Goodwill and Intangible Assets Disclosure [Line Items]        
Amortization expense $ 8,624 $ 8,319 $ 16,887 $ 16,368