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Reconciliation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income	$ 13,236	$ 23,894
Basic weighted average number of shares outstanding	33,159	33,569
Dilutive effect of restricted stock	329	16
Weighted average shares outstanding - diluted	33,488	33,585
Earnings per share - basic	$ 0.40	$ 0.71
Earnings per share - diluted	$ 0.40	$ 0.71

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