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Shareholders' Equity - Additional Information (Detail) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended
	Feb. 28, 2011	Mar. 31, 2013	Mar. 31, 2012
Class of Stock [Line Items]
Share repurchase program, authorized amount	$ 50,000,000
Stock repurchase program, term (in years)		3 years
Stock repurchase program, expiration date		2014-02
Stock repurchased and retired, shares		74	125
Stock repurchased and retired, value		2,282,000	3,750,000
Stock repurchase program, average price per share		$ 30.79	$ 30.08
Stock repurchase program, remaining authorized repurchase amount		$ 16,600,000

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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