Preferred Stock and Units - Schedule of Series of Cumulative Redeemable Perpetual Preferred Stock (Detail) - $ / shares		12 Months Ended
	Jul. 15, 2019	Dec. 31, 2021	Dec. 31, 2020	May 31, 2019	Apr. 30, 2019
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		1,510,000	1,610,000
Preferred Stock, Number of Shares Outstanding		1,510,000	1,610,000
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		1,384,610	1,554,610
Preferred Stock, Number of Shares Outstanding		1,384,610	1,554,610
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	1,200,000	1,200,000	1,200,000
Preferred Stock, Number of Shares Outstanding		1,165,000	1,200,000
Preferred Stock, Quarterly Distributions Per Share	$ 0.41823	$ 0.515625