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Reconciliation of Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share Disclosure [Line Items]
Net income for basic and diluted earnings per share	$ 15,364	$ 13,662
Weighted average shares outstanding-basic	36,855	37,043
Dilutive effect of stock options and restricted stock	94	100
Weighted average shares outstanding-diluted	36,949	37,143
Earnings per share-basic	$ 0.42	$ 0.37
Earnings per share-diluted	$ 0.42	$ 0.37

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