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Reconciliation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income for basic and diluted earnings per share	$ 18,467	$ 18,676	$ 28,743	$ 30,711
Weighted average shares outstanding - basic	35,986	36,674	36,071	36,667
Dilutive effect of stock options and restricted stock	89	140	51	102
Weighted average shares outstanding - diluted	36,075	36,814	36,122	36,769
Earnings per share - basic	$ 0.51	$ 0.51	$ 0.80	$ 0.84
Earnings per share - diluted	$ 0.51	$ 0.51	$ 0.80	$ 0.84

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