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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income	$ 24,781	$ 26,105	$ 51,171	$ 79,216
Weighted average shares outstanding - basic	33,177	33,034	33,169	33,385
Dilutive effect of stock options and restricted stock	420	231	344	137
Weighted average shares outstanding - diluted	33,597	33,265	33,513	33,522
Earnings per share - basic	$ 0.75	$ 0.79	$ 1.54	$ 2.37
Earnings per share - diluted	$ 0.74	$ 0.78	$ 1.53	$ 2.36

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