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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Income Tax Disclosure [Abstract]  
Unrecognized tax benefits $ 110,634
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate 66,142
Accrued interest related to the gross unrecognized tax benefits excluded from the unrecognized tax benefits $ 5,709