Earnings Per Share - Computation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 37,338	$ 27,422	$ 89,076	$ 89,433
Average number of common shares outstanding (in shares)	33,348	29,714	32,332	29,720
Effect of dilutive stock options and restricted stock (in shares)	115	137	137	167
Average number of common shares outstanding used to calculate diluted earnings per share (in shares)	33,463	29,851	32,469	29,887
Options excluded from diluted earnings per share because of their antidilutive effect (in shares)	0	0	0	0