Earnings (Loss) Per Share - Components of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 44,007	$ 56,519	$ 94,272	$ 131,415
Weighted-average number of common shares outstanding - basic (shares)	31,254,125	32,712,616	31,535,103	32,834,150
Share-based compensation plans (shares)	337,017	866,397	430,894	1,116,823
Weighted-average number of common shares - diluted (shares)	31,591,142	33,579,013	31,965,997	33,950,973
Basic earnings per common share (usd per share)	$ 1.41	$ 1.73	$ 2.99	$ 4.00
Diluted earnings per common share (usd per share)	$ 1.39	$ 1.68	$ 2.95	$ 3.87