Shareholders' Equity - Summary of Preferred Shares of Beneficial Interest (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Class Of Stock [Line Items]
Number of shares	22,400,000		22,400,000		22,400,000
Liquidation preference	$ 560,000,000		$ 560,000,000		$ 560,000,000
Issuance discount	18,518,000		18,518,000
Carrying value	$ 541,482,000		$ 541,482,000		$ 541,482,000
Series A 8.125% Preferred Stock [Member]
Class Of Stock [Line Items]
Number of shares	4,600,000		4,600,000
Liquidation preference	$ 115,000,000		$ 115,000,000
Issuance discount	3,828,000		3,828,000
Carrying value	$ 111,172,000		$ 111,172,000
Dividends per share	$ 0.51	$ 0.51	$ 1.53	$ 1.53
Series B 8.00% Preferred Stock [Member]
Class Of Stock [Line Items]
Number of shares	7,800,000		7,800,000
Liquidation preference	$ 195,000,000		$ 195,000,000
Issuance discount	6,465,000		6,465,000
Carrying value	$ 188,535,000		$ 188,535,000
Dividends per share	$ 0.5	0.5	$ 1.5	1.5
Series C 6.75% Preferred Stock [Member]
Class Of Stock [Line Items]
Number of shares	10,000,000		10,000,000
Liquidation preference	$ 250,000,000		$ 250,000,000
Issuance discount	8,225,000		8,225,000
Carrying value	$ 241,775,000		$ 241,775,000
Dividends per share	$ 0.42	$ 0.42	$ 1.26	$ 1.26