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Earnings Per Share - Computation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Net income	$ 29,034	$ 24,892	$ 56,783	$ 60,725
Average number of common shares outstanding (in shares)	33,121	33,219	33,183	33,257
Effect of dilutive stock options and restricted stock (in shares)	123	83	123	114
Average number of common shares outstanding used to calculate diluted earnings per share (in shares)	33,244	33,302	33,306	33,371
Options excluded from diluted earnings per share because of their antidilutive effect (in shares)	0	0	0	0

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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