Earnings Per Common Share - Computations of Diluted Earnings Per Common 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 equity	$ 665,000	$ 621,655	$ 2,183,777	$ 1,154,645
Less: Income attributable to unvested stock-based compensation awards	(1,234)	(1,101)	(3,965)	(2,239)
Net income available to common shareholders	$ 663,766	$ 620,554	$ 2,179,812	$ 1,152,406
Adjusted weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards	166,217	174,921	166,787	160,793
Less: Unvested stock-based compensation awards	(308)	(312)	(299)	(319)
Plus: Incremental shares from assumed conversion of stock-based compensation awards	661	1,073	605	821
Adjusted weighted-average shares outstanding	166,570	175,682	167,093	161,295
Diluted earnings per common share	$ 3.98	$ 3.53	$ 13.05	$ 7.14