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Earnings Per Share - Additional Information (Detail)	1 Months Ended
Earnings Per Share - Additional Information (Detail)	Sep. 21, 2011	Mar. 31, 2011
Equity And Earnings Per Share [Line Items]
Common stock repurchased	80,771,143
Initial public offering of common stock shares		87,719,300

Number of new stock issued during the period.

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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