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Common Stock Repurchase Program - Additional Information (Detail) (USD $)	6 Months Ended	34 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Aug. 28, 2008 Maximum
Class of Stock [Line Items]
Board of Directors authorized the repurchase of common stock			2,000,000
Repurchase shares, value	$ 0
Repurchased and retired, shares	0	1,762,576
Repurchased and retired, aggregate price		$ 65,925,000

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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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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