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Stock Repurchase - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Feb. 09, 2012	Dec. 31, 2012
Stock Repurchase Program [Line Items]
Amount of authorized repurchase of outstanding common stock	$ 100,000,000
Maximum prevailing market price period, years	2 years
Common stock repurchased, shares outstanding		1,372,853
Stock repurchases during period value		$ 50,025,000

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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