Earnings (Loss) Per Share - Components of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ 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 attributable to common shareholders, basic	$ 82,953	$ 61,364	$ 177,225	$ 192,779
Net income attributable to common shareholders, diluted	$ 82,953	$ 61,364	$ 177,225	$ 192,779
Weighted-average number of common shares outstanding – basic (shares)	31,290,581	32,455,814	31,452,700	32,706,652
Share-based compensation plans (shares)	884,503	770,793	583,759	1,000,212
Weighted-average number of common shares – diluted (shares)	32,175,084	33,226,607	32,036,459	33,706,864
Basic earnings per common share (usd per share)	$ 2.65	$ 1.89	$ 5.63	$ 5.89
Diluted earnings per common share (usd per share)	$ 2.58	$ 1.85	$ 5.53	$ 5.72