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Noncontrolling Interest Represented by Preferred Operating Partnership Units - Additional Information (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 24 Months Ended
Aug. 31, 2021
shares
Apr. 25, 2019
shares
Dec. 01, 2018
shares
Jun. 25, 2007
USD ($)
Dec. 31, 2014
USD ($)
$ / shares
Oct. 31, 2014
USD ($)
shares
Jun. 30, 2007
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2020
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2014
$ / shares
Dec. 31, 2020
USD ($)
Noncontrolling Interest [Line Items]                        
Loans and notes to affiliates | $               $ 100,000   $ 100,000   $ 100,000
Preferred units outstanding (in shares)               5,733,498   5,733,498    
Note receivable interest rate         5.00%              
Loan to affiliates | $         $ 20,230              
Series A Units                        
Noncontrolling Interest [Line Items]                        
Fixed priority return on preferred OP units, amount | $             $ 101,700          
Fixed priority return on preferred OP units, stated return rate             2.30%          
Fixed priority return on preferred OP units, liquidation value | $           $ 101,700 $ 115,000          
Preferred units outstanding (in shares)           875,480            
Series B Units                        
Noncontrolling Interest [Line Items]                        
Preferred units outstanding (in shares)               1,522,727   1,522,727    
Liquidation value (in dollars per share) | $ / shares               $ 25.00   $ 25.00    
Fixed liquidation value | $               $ 38,068   $ 38,068    
Annual rate of return percentage                   6.00%    
Shares converted (in shares) 113,360                      
Series C Units                        
Noncontrolling Interest [Line Items]                        
Liquidation value (in dollars per share) | $ / shares         $ 42.10           $ 42.10  
Shares converted (in shares)   296,020 407,996                  
Period from date of issuance after which preferred OP units will become redeemable at the option of the holder                     1 year  
Preferred OP units conversion ratio                     0.9145  
Series D Units                        
Noncontrolling Interest [Line Items]                        
Preferred units outstanding (in shares)               4,694,485   4,694,485    
Liquidation value (in dollars per share) | $ / shares               $ 25.00   $ 25.00    
Fixed liquidation value | $               $ 117,362   $ 117,362    
Series D Units | Minimum                        
Noncontrolling Interest [Line Items]                        
Annual rate of return percentage                   3.00%    
Series D Units | Maximum                        
Noncontrolling Interest [Line Items]                        
Annual rate of return percentage                   5.00%    
Operating Partnership Holders of A Units | Series A Units                        
Noncontrolling Interest [Line Items]                        
Loans and notes to affiliates | $       $ 100,000                
Maximum number of preferred OP units converted prior to the maturity date of the loan (in shares)           114,500            
Note receivable interest rate       2.10%                
Noncontrolling Interest - Operating Partnership                        
Noncontrolling Interest [Line Items]                        
Issuance of units upon conversion (in shares)   270,709 373,113                  
Loan receivable, reduction of noncontrolling interests | $               $ 1,900   $ 1,900   $ 2,311
Common Stock | Redemption of Operating Partnership units for stock                        
Noncontrolling Interest [Line Items]                        
Redemption of Preferred Units (in shares) 15,265             15,265 30,495