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Reconciliation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net income for basic and diluted earnings per share	$ 17,924	$ 19,832	$ 56,561	$ 48,575
Weighted average shares outstanding - basic	33,212	35,769	34,098	35,970
Dilutive effect of stock options and restricted stock	154	134	74	79
Weighted average shares outstanding - diluted	33,366	35,903	34,172	36,049
Earnings per share - basic	$ 0.54	$ 0.55	$ 1.66	$ 1.35
Earnings per share - diluted	$ 0.54	$ 0.55	$ 1.66	$ 1.35

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