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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Income Taxes [Line Items]
Unrecognized tax benefits	$ 111,084
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate	63,830
Accrued interest related to the gross unrecognized tax benefits excluded from the unrecognized tax benefits	$ 3,808

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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