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Stockholders' Equity - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Aug. 31, 2011
Stockholders Equity Note [Line Items]
Repurchase of outstanding shares of common stock		3.00%
Repurchase of outstanding shares of common stock under Stock Repurchase Program		730,000
Average price repurchased shares of common stock	$ 14.16
Common Stock
Stockholders Equity Note [Line Items]
Repurchase of shares	23,592

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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