Income Taxes - Components of Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Current income tax expense (benefit)	$ 144,718	$ 129,647	$ 134,948
Deferred income tax expense (benefit)	22,713	35,264	35,449
Income tax expense (benefit)	167,431	164,911	170,397
Shareholders’ equity:
Other comprehensive income (loss)	(93,480)	314,845	405,472
Income tax expense (benefit)	$ 73,951	$ 479,756	$ 575,869