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Share Repurchase Program - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended	63 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Sep. 24, 2007
Share Repurchases [Line Items]
Stock repurchase program authorized aggregate amount			$ 100,000
Stock repurchase program total cost	$ 7,071
Stock repurchase program average price	$ 23.57
Share repurchased under share repurchase program		300,000

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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