Shareholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Dividends paid by subsidiaries to parent company	$ 479,000	$ 486,000	$ 480,000
Maximum amount of dividends expected to be available from subsidiaries without regulatory approval during next year	347,000
Restricted net assets	1,200,000
Retained earnings restricted by lenders' covenants	4,300,000
Retained earnings	$ 6,182,100	$ 5,874,109