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Reconciliation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income for basic and diluted earnings per share	$ 17,230	$ 13,236
Weighted average shares outstanding - basic	33,419	33,159
Dilutive effect of restricted stock	356	329
Weighted average shares outstanding - diluted	33,775	33,488
Earnings per share - basic	$ 0.52	$ 0.40
Earnings per share - diluted	$ 0.51	$ 0.40

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