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Reconciliation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net income for basic and diluted earnings per share	$ 10,334	$ 17,965
Weighted average shares outstanding - basic	33,205	35,137
Dilutive effect of stock options and restricted stock	168	(15)
Weighted average shares outstanding - diluted	33,373	35,122
Earnings per common share - basic	$ 0.31	$ 0.51
Earnings per common share - diluted	$ 0.31	$ 0.51

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Incremental decremental common shares attributable to share based payment arrangements.

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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