Preferred Stock and Units - Schedule of Series of Cumulative Redeemable Perpetual Preferred Stock (Detail) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Class Of Stock [Line Items]
Preferred Stock, Liquidation Preference	$ 25.00	$ 25.00
8.0% Series B Cumulative Redeemable Perpetual Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred Stock, Per Annum Rate	8.00%	8.00%
Preferred Stock, Liquidation Preference	$ 25.00
Preferred Stock, Number of Shares Issued	1,497,100	1,510,000
Preferred Stock, Number of Shares Outstanding	1,497,100	1,510,000
Preferred Stock, Quarterly Distributions Per Share	$ 0.500000
7.875% Series C Cumulative Redeemable Perpetual Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred Stock, Per Annum Rate	7.875%	7.875%
Preferred Stock, Liquidation Preference	$ 25.00
Preferred Stock, Number of Shares Issued	1,375,010	1,384,610
Preferred Stock, Number of Shares Outstanding	1,375,010	1,384,610
Preferred Stock, Quarterly Distributions Per Share	$ 0.492188
8.25% Series D Cumulative Redeemable Perpetual Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred Stock, Per Annum Rate	8.25%	8.25%
Preferred Stock, Liquidation Preference	$ 25.00
Preferred Stock, Number of Shares Issued	1,165,000	1,165,000
Preferred Stock, Number of Shares Outstanding	1,165,000	1,165,000
Preferred Stock, Quarterly Distributions Per Share	$ 0.515625