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Preferred Stock and Units - Schedule of Series of Cumulative Redeemable Perpetual Preferred Stock (Detail) - $ / shares
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 15, 2019
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
May 31, 2019
Class Of Stock [Line Items]          
Preferred Stock, Liquidation Preference   $ 25.00 $ 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% 8.00%  
Preferred Stock, Liquidation Preference   $ 25 $ 25 $ 25  
Preferred Stock, Number of Shares Issued   1,610,000 1,610,000 1,610,000  
Preferred Stock, Number of Shares Outstanding   1,610,000 1,610,000 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% 7.875%  
Preferred Stock, Liquidation Preference   $ 25 $ 25 $ 25  
Preferred Stock, Number of Shares Issued   1,554,610 1,554,610 1,352,141  
Preferred Stock, Number of Shares Outstanding   1,554,610 1,554,610 1,352,141  
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% 8.25%  
Preferred Stock, Liquidation Preference   $ 25 $ 25 $ 25  
Preferred Stock, Number of Shares Issued   1,200,000 1,200,000 0 1,200,000
Preferred Stock, Number of Shares Outstanding   1,200,000 1,200,000 0  
Preferred Stock, Quarterly Distributions Per Share $ 0.41823 $ 0.515625