Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Detail)

v3.20.1
Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Detail) - $ / shares
 1 Months Ended
Jul. 06, 2020
Jul. 02, 2020
Jun. 30, 2020
Jun. 25, 2020
Jun. 19, 2020
Jun. 05, 2020
May 29, 2020
May 28, 2020
May 19, 2020
May 06, 2020
May 05, 2020
Apr. 30, 2020
Apr. 29, 2020
Apr. 24, 2020
Jun. 30, 2020
May 31, 2020
Apr. 30, 2020
Apr. 14, 2020
Subsequent event | Series D Preferred Stock                                    
Dividends Payable [Line Items]                                    
Distribution per share (in dollars per share)                                   $ 0.4374999
Subsequent event | Series E Preferred Stock                                    
Dividends Payable [Line Items]                                    
Distribution per share (in dollars per share)                                   0.414063
Subsequent event | Series F Preferred Stock                                    
Dividends Payable [Line Items]                                    
Distribution per share (in dollars per share)                                   0.375
Subsequent event | Senior Common Stock                                    
Dividends Payable [Line Items]                                    
Distribution per share (in dollars per share)                                   0.2625
Subsequent event | Common Stock                                    
Dividends Payable [Line Items]                                    
Distribution per share (in dollars per share)                                   $ 0.37545
Subsequent event | April 2020                                    
Dividends Payable [Line Items]                                    
Record Date                           Apr. 24, 2020        
Forecast | May 2020                                    
Dividends Payable [Line Items]                                    
Record Date                 May 19, 2020                  
Payment Date             May 29, 2020                      
Forecast | May 2020 | Series D Preferred Stock                                    
Dividends Payable [Line Items]                                    
Distribution per share (in dollars per share)             $ 0.1458333                      
Forecast | May 2020 | Series E Preferred Stock                                    
Dividends Payable [Line Items]                                    
Distribution per share (in dollars per share)             0.138021                      
Forecast | May 2020 | Series F Preferred Stock                                    
Dividends Payable [Line Items]                                    
Payable to the Holders of Record During the Month of:               May 28, 2020                    
Payment Date           Jun. 05, 2020                        
Distribution per share (in dollars per share)           $ 0.125                        
Forecast | May 2020 | Senior Common Stock                                    
Dividends Payable [Line Items]                                    
Payable to the Holders of Record During the Month of:                               May    
Payment Date           Jun. 05, 2020                        
Distribution per share (in dollars per share)           $ 0.0875                        
Forecast | May 2020 | Common Stock                                    
Dividends Payable [Line Items]                                    
Distribution per share (in dollars per share)             $ 0.12515                      
Forecast | June 2020                                    
Dividends Payable [Line Items]                                    
Record Date         Jun. 19, 2020                          
Payment Date     Jun. 30, 2020                              
Forecast | June 2020 | Series D Preferred Stock                                    
Dividends Payable [Line Items]                                    
Distribution per share (in dollars per share)     $ 0.1458333                       $ 0.1458333      
Forecast | June 2020 | Series E Preferred Stock                                    
Dividends Payable [Line Items]                                    
Distribution per share (in dollars per share)     0.138021                       $ 0.138021      
Forecast | June 2020 | Series F Preferred Stock                                    
Dividends Payable [Line Items]                                    
Payable to the Holders of Record During the Month of:       June 25, 2020                            
Payment Date   Jul. 02, 2020                                
Distribution per share (in dollars per share)   $ 0.125                                
Forecast | June 2020 | Senior Common Stock                                    
Dividends Payable [Line Items]                                    
Payable to the Holders of Record During the Month of:                             June      
Payment Date Jul. 06, 2020                                  
Distribution per share (in dollars per share) $ 0.0875                                  
Forecast | June 2020 | Common Stock                                    
Dividends Payable [Line Items]                                    
Distribution per share (in dollars per share)     $ 0.12515                       $ 0.12515      
Forecast | Subsequent event | April 2020                                    
Dividends Payable [Line Items]                                    
Payment Date                       Apr. 30, 2020            
Forecast | Subsequent event | April 2020 | Series D Preferred Stock                                    
Dividends Payable [Line Items]                                    
Distribution per share (in dollars per share)                       $ 0.1458333         $ 0.1458333  
Forecast | Subsequent event | April 2020 | Series E Preferred Stock                                    
Dividends Payable [Line Items]                                    
Distribution per share (in dollars per share)                       0.138021         $ 0.138021  
Forecast | Subsequent event | April 2020 | Series F Preferred Stock                                    
Dividends Payable [Line Items]                                    
Payable to the Holders of Record During the Month of:                         April 29, 2020          
Payment Date                     May 05, 2020              
Distribution per share (in dollars per share)                     $ 0.125              
Forecast | Subsequent event | April 2020 | Senior Common Stock                                    
Dividends Payable [Line Items]                                    
Payable to the Holders of Record During the Month of:                                 April  
Payment Date                   May 06, 2020                
Distribution per share (in dollars per share)                   $ 0.0875                
Forecast | Subsequent event | April 2020 | Common Stock                                    
Dividends Payable [Line Items]                                    
Distribution per share (in dollars per share)                       $ 0.12515         $ 0.12515