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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Income Tax Disclosure [Abstract]  
Unrecognized tax benefits $ 111,779
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate 65,659
Accrued interest related to the gross unrecognized tax benefits excluded from the unrecognized tax benefits $ 2,845