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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income for basic and diluted earnings per share	$ 15,334	$ 17,924	$ 35,210	$ 56,561
Weighted average shares outstanding - basic	33,227	33,212	33,217	34,098
Dilutive effect of stock options and restricted stock	108	154	106	74
Weighted average shares outstanding - diluted	33,335	33,366	33,323	34,172
Earnings per share - basic	$ 0.46	$ 0.54	$ 1.06	$ 1.66
Earnings per share - diluted	$ 0.46	$ 0.54	$ 1.06	$ 1.66

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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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