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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, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Net income for basic and diluted earnings per share	$ 22,374	$ 19,832	$ 18,467	$ 10,276	$ 16,356	$ 4,491	$ 18,676	$ 12,035	$ 70,949	$ 51,558	$ 69,110
Weighted average shares outstanding - basic									35,876	36,590	36,829
Dilutive effect of stock options and restricted stock									92	142	153
Weighted average shares outstanding - diluted									35,968	36,732	36,982
Earnings per share - basic	$ 0.63	$ 0.55	$ 0.51	$ 0.28	$ 0.45	$ 0.12	$ 0.51	$ 0.33	$ 1.98	$ 1.41	$ 1.88
Earnings per share - diluted	$ 0.63	$ 0.55	$ 0.51	$ 0.28	$ 0.45	$ 0.12	$ 0.51	$ 0.33	$ 1.97	$ 1.40	$ 1.87

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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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