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Reconciliation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 43,338	$ 24,781	$ 87,160	$ 51,171
Weighted average shares outstanding - basic	33,433	33,177	33,427	33,169
Dilutive effect of stock options and restricted stock	440	420	415	344
Weighted average shares outstanding - diluted	33,873	33,597	33,842	33,513
Earnings per share - basic	$ 1.30	$ 0.75	$ 2.61	$ 1.54
Earnings per share - diluted	$ 1.28	$ 0.74	$ 2.58	$ 1.53

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