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Reconciliation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net income for basic and diluted earnings per share	$ 18,244	$ 17,924	$ 20,671	$ 17,965	$ 22,374	$ 19,832	$ 18,467	$ 10,276	$ 74,805	$ 70,949	$ 51,558
Weighted average shares outstanding - basic									33,841	35,876	36,590
Dilutive effect of stock options and restricted stock									108	92	142
Weighted average shares outstanding - diluted									33,949	35,968	36,732
Earnings per share - basic	$ 0.55	$ 0.54	$ 0.61	$ 0.51	$ 0.63	$ 0.55	$ 0.51	$ 0.28	$ 2.21	$ 1.98	$ 1.41
Earnings per share - diluted	$ 0.55	$ 0.54	$ 0.61	$ 0.51	$ 0.63	$ 0.55	$ 0.51	$ 0.28	$ 2.20	$ 1.97	$ 1.40

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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