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Common Stock Repurchase Program - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	55 Months Ended
	Mar. 31, 2013	Mar. 31, 2013	Aug. 28, 2008 Maximum
Class of Stock [Line Items]
Board of Directors authorized the repurchase of common stock			2,000,000
Repurchased and retired, shares	30,000	1,907,576
Repurchased and retired, aggregate purchase price	$ 2,683	$ 80,984

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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