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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Income Tax Disclosure [Abstract]  
Unrecognized tax benefits $ 109,292
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate 64,136
Accrued interest related to the gross unrecognized tax benefits excluded from the unrecognized tax benefits $ 2,560