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Subsequent Events - Additional Information (Detail) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	9 Months Ended	1 Months Ended
	Sep. 30, 2012	Oct. 31, 2012 Repurchase of Equity
Subsequent Event [Line Items]
Repurchase of common stock, shares		0.1
Repurchase of common stock, value	$ 1,438	$ 700

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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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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