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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income available to common equity	$ 621,655	$ 478,410	$ 1,154,645	$ 1,349,628
Less: Income attributable to unvested stock-based compensation awards	(1,101)	(2,449)	(2,239)	(6,816)
Net income available to common shareholders	$ 620,554	$ 475,961	$ 1,152,406	$ 1,342,812
Adjusted weighted-average shares outstanding:
Common and unvested stock-based compensation awards	174,921	129,580	160,793	129,529
Less: Unvested stock-based compensation awards	(312)	(891)	(319)	(897)
Plus: Incremental shares from assumed conversion of stock-based compensation awards and warrants to purchase common stock	1,073	155	821	154
Adjusted weighted-average shares outstanding	175,682	128,844	161,295	128,786
Diluted earnings per common share	$ 3.53	$ 3.69	$ 7.14	$ 10.43