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Basis of Presentation - Additional Information (Detail)	1 Months Ended
Basis of Presentation - Additional Information (Detail)	Apr. 19, 2011
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Stock split conversion ratio	2
Stock split, shares per common stock	Two-for-one stock split with respect to our common stock

- Definition

Description of the stock split arrangement. Also provide the retroactive effect given by a stock split that occurs after the balance date but before the release of financial statements.

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