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Mortgage and Other Indebtedness - Additional Information (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 17, 2021
$ / shares
Oct. 25, 2018
USD ($)
extension
Mar. 31, 2021
USD ($)
day
$ / shares
Sep. 30, 2021
USD ($)
$ / shares
Mar. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
extension
$ / shares
Sep. 30, 2020
USD ($)
Jun. 30, 2021
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]                  
Principal       $ 1,298,980,000   $ 1,298,980,000     $ 1,176,076,000
Letters of credit outstanding, amount       1,200,000   1,200,000      
Letters of credit outstanding, amount advanced       0   0      
Value in unencumbered asset pool       1,400,000,000   1,400,000,000      
Net proceeds from offering           175,000,000 $ 300,000,000    
Purchase of capped calls         $ 9,800,000        
Percentage bearing fixed interest, amount       1,000,000,000   1,000,000,000      
Percentage bearing variable interest, amount       279,200,000   279,200,000      
Three Fixed-Rate Secured Loans                  
Debt Instrument [Line Items]                  
Long-term debt, fair value       1,100,000,000   1,100,000,000      
Variable rate debt                  
Debt Instrument [Line Items]                  
Long-term debt, fair value       279,000,000   279,000,000      
Senior unsecured notes                  
Debt Instrument [Line Items]                  
Percentage bearing fixed interest, amount       550,000,000   550,000,000      
Senior unsecured notes | Fixed rate debt                  
Debt Instrument [Line Items]                  
Principal       $ 550,000,000   $ 550,000,000     550,000,000
Exchangeable senior notes - fixed rate | Fixed rate debt                  
Debt Instrument [Line Items]                  
Interest rate       0.75%   0.75%   0.75%  
Principal       $ 175,000,000   $ 175,000,000      
Principal amount of debt issued       175,000,000   175,000,000      
Net proceeds from offering     $ 169,700,000            
Interest expense       $ 500,000   $ 1,100,000      
Conversion price (in USD per share) | $ / shares       $ 25.21   $ 25.21      
Exchange premium, percent of closing price     25.00%            
Percentage of exchange price           130.00%      
Trading days | day     20            
Consecutive trading days | day     30            
Percentage of redemption price     100.00%            
Exchangeable conversion ratio     0.0396628            
Exchangeable senior notes - fixed rate | Capped Call                  
Debt Instrument [Line Items]                  
Exchange premium, percent of closing price     50.00%            
Exchange price (in USD per share) | $ / shares     $ 30.26            
Purchase of capped calls           $ 9,800,000      
Exchangeable senior notes - fixed rate | Common Shares | Fixed rate debt                  
Debt Instrument [Line Items]                  
Common stock closing price (in USD per share) | $ / shares $ 20.17                
Revolving credit facility                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity       $ 600,000,000   $ 600,000,000      
Debt instrument, maturity date, number of extensions | extension           1      
Debt instrument, maturity date, extension           12 months      
Line of credit facility, option to increase maximum borrowing capacity       1,200,000,000   $ 1,200,000,000      
Principal       0   0     $ 25,000,000
Line of credit facility, remaining borrowing capacity       $ 416,700,000   $ 416,700,000      
LIBOR                  
Debt Instrument [Line Items]                  
Basis spread on variable rate           0.13%      
Minimum | Three Fixed-Rate Secured Loans                  
Debt Instrument [Line Items]                  
Interest rate       3.78%   3.78%      
Percentage bearing fixed interest       2.78%   2.78%      
Minimum | Variable rate debt                  
Debt Instrument [Line Items]                  
Percentage bearing variable interest       2.77%   2.77%      
Maximum | Three Fixed-Rate Secured Loans                  
Debt Instrument [Line Items]                  
Interest rate       5.73%   5.73%      
Percentage bearing fixed interest       3.87%   3.87%      
Maximum | Variable rate debt                  
Debt Instrument [Line Items]                  
Percentage bearing variable interest       3.52%   3.52%      
Maximum | LIBOR                  
Debt Instrument [Line Items]                  
Basis spread on variable rate           160.00%      
KRG, LP                  
Debt Instrument [Line Items]                  
Net proceeds from offering           $ 175,000,000 $ 300,000,000    
Purchase of capped calls         $ 9,800,000        
KRG, LP | Unsecured term loan | Term Loan Due October 2025                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity   $ 250,000,000              
Debt instrument, maturity date, number of extensions | extension   3              
Debt instrument, maturity date, extension   1 year              
Line of credit facility, option to increase maximum borrowing capacity   $ 300,000,000