Shareholder's Equity (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 11, 2023	Dec. 31, 2020
Shareholders Equity
Common stock, shares authorized	426,000,000	426,000,000.0
Common stock, par value (per share)	$ 0.01	$ 0.01
Share repurchases		$ 50,000,000.0	$ 150,000,000.0
Increase (Decrease) to Quarterly Dividend Rate				5.00%
Dividends payable amount per share	$ 0.23
Dividends payable	$ 38,000,000.0	$ 36,200,000
Dividends paid per common share	$ 0.88	$ 0.84	$ 0.80
December 2020 Share Repurchase Program
Shareholders Equity
Authorized amount to repurchase shares of common stock					$ 750,000,000
Remaining authorized repurchase amount	$ 600,000,000
Common shares
Shareholders Equity
Share repurchase (in shares)		1,000,000	2,100,000
Common shares | December 2020 Share Repurchase Program
Shareholders Equity
Share repurchase (in shares)	0
Capital contribution reserve
Shareholders Equity
Share repurchases		$ 50,000,000	$ 150,000,000.0