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Subsequent Events - Additional Information (Detail) - $ / shares
3 Months Ended
Oct. 28, 2019
Oct. 15, 2019
Oct. 11, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Subsequent Event [Line Items]                  
Dividend distributed       $ 0.13 $ 0.13 $ 0.125 $ 0.125 $ 0.12 $ 0.115
Subsequent Event [Member]                  
Subsequent Event [Line Items]                  
Dividend paid     $ 0.13            
Dividend record date Dec. 13, 2019   Sep. 13, 2019            
Dividend distributed $ 0.13                
Dividend payment date Jan. 10, 2020                
Subsequent Event [Member] | 7.875% Series C Cumulative Redeemable Perpetual Preferred Stock [Member]                  
Subsequent Event [Line Items]                  
Dividend record date Dec. 31, 2019 Oct. 01, 2019              
Dividend paid   $ 0.4921875              
Dividend payment date Jan. 15, 2020                
Preferred stock dividends declared $ 0.4921875                
Subsequent Event [Member] | 8.25% Series D Cumulative Redeemable Perpetual Preferred Stock [Member]                  
Subsequent Event [Line Items]                  
Dividend record date Dec. 31, 2019 Oct. 01, 2019              
Dividend paid   $ 0.515625              
Dividend payment date Jan. 15, 2020                
Preferred stock dividends declared $ 0.515625                
Subsequent Event [Member] | 8% Series B Cumulative Redeemable Perpetual Preferred Stock [Member]                  
Subsequent Event [Line Items]                  
Dividend record date Dec. 31, 2019 Oct. 01, 2019              
Dividend paid   $ 0.50              
Dividend payment date Jan. 15, 2020                
Preferred stock dividends declared $ 0.50