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Reconciliation of Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share Disclosure [Line Items]
Net income for basic and diluted earnings per share	$ 18,610	$ 16,952	$ 33,974	$ 30,614
Weighted average shares outstanding - basic	36,870	37,070	36,863	37,057
Dilutive effect of stock options and restricted stock	119	120	106	110
Weighted average shares outstanding - diluted	36,989	37,190	36,969	37,167
Earnings per share - basic	$ 0.50	$ 0.46	$ 0.92	$ 0.83
Earnings per share - diluted	$ 0.50	$ 0.46	$ 0.92	$ 0.82

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