Earnings Per Share - Computation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income	$ 30,590	$ 37,338	$ 91,315	$ 89,076
Average number of common shares outstanding (in shares)	33,263	33,348	33,259	32,332
Effect of dilutive stock options and restricted stock (in shares)	56	115	97	137
Average number of common shares outstanding used to calculate diluted earnings per share (in shares)	33,319	33,463	33,356	32,469
Options excluded from diluted earnings per share because of their antidilutive effect (in shares)	0	0	0	0