Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, 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 available to common shareholders	$ 22,239	$ 28,746	$ 64,672	$ 73,792
Less: earnings allocated to participating securities	221	339	660	847
Net income allocated to common shareholders	$ 22,018	$ 28,407	$ 64,012	$ 72,945
Weighted average number of common shares outstanding - basic (in shares)	65,064	64,842	65,030	64,547
Share-based plans (in shares)	158	219	180	208
Weighted average number of common shares outstanding - diluted (in shares)	65,222	65,061	65,210	64,755
Basic earnings per share (in usd per share)	$ 0.34	$ 0.44	$ 0.98	$ 1.13
Diluted earnings per share (in usd per share)	$ 0.34	$ 0.44	$ 0.98	$ 1.13