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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, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Earnings Per Share Disclosure [Line Items]
Net income for basic and diluted earnings per share	$ 16,952	$ 14,390	$ 30,614	$ 24,888
Weighted average shares outstanding - basic	37,070	36,901	37,057	36,893
Dilutive effect of stock options and restricted stock	120	159	110	148
Weighted average shares outstanding - diluted	37,190	37,060	37,167	37,041
Earnings per share - basic	$ 0.46	$ 0.39	$ 0.83	$ 0.67
Earnings per share - diluted	$ 0.46	$ 0.39	$ 0.82	$ 0.67

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