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Stock Repurchase Program - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended	12 Months Ended	62 Months Ended
	Nov. 30, 2010	Dec. 31, 2011	Dec. 31, 2012
Stock Repurchase Program
Stock repurchase program, authorized amount	$ 200,000,000
Repurchase of stock, shares			2.6
Repurchase of stock, value		$ 31,175,000	$ 31,175,000
Common stock average price			$ 11.84

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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