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Stock Repurchase Plan - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified		3 Months Ended	6 Months Ended
	Apr. 30, 2012 Share Repurchase Program Two Thousand And Twelve	Jun. 30, 2012 2012 Stock Repurchase Program	Jun. 30, 2012 2012 Stock Repurchase Program
Share Repurchases [Line Items]
Common stock repurchase authorized shares	1,000,000
Repurchased shares of common Stock		219,476	219,476
Repurchased shares of common stock average price per share		$ 12.35	$ 12.35
Repurchased shares of common Stock aggregate purchase price		$ 2.7	$ 2.7
Remaining authorized funds for stock repurchase		780,524	780,524

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 value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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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