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Mortgage and Other Indebtedness - Additional Information (Details)
 1 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Oct. 25, 2018
USD ($)
extension
Mar. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
extension
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]            
Amortization of debt issuance costs         $ 1,640,000 $ 2,128,000
Letters of credit outstanding, amount $ 1,200,000     $ 1,200,000 1,200,000  
Letters of credit outstanding, amount advanced 0     0 0  
Value in unencumbered asset pool 1,300,000,000     1,300,000,000 1,300,000,000  
Percentage bearing fixed interest, amount 846,400,000     846,400,000 846,400,000  
Percentage bearing variable interest, amount 355,300,000     355,300,000 355,300,000  
Three Fixed-Rate Secured Loans            
Debt Instrument [Line Items]            
Long-term debt, fair value 846,600,000     846,600,000 846,600,000  
Variable rate debt            
Debt Instrument [Line Items]            
Long-term debt, fair value 337,500,000     337,500,000 337,500,000  
Senior unsecured notes            
Debt Instrument [Line Items]            
Percentage bearing fixed interest, amount 550,000,000     550,000,000 550,000,000  
Revolving credit facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity 600,000,000     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 $ 1,200,000,000  
Loan proceeds     $ 300,000,000      
Repayments of lines of credit       250,000,000    
Long-term line of credit 50,000,000     50,000,000 50,000,000  
Line of credit facility, remaining borrowing capacity $ 448,600,000     $ 448,600,000 $ 448,600,000  
London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate (as percent) 0.15%          
Minimum | Three Fixed-Rate Secured Loans            
Debt Instrument [Line Items]            
Interest rate (as percent) 3.78%     3.78% 3.78%  
Percentage bearing fixed interest (as percent) 3.46%     3.46% 3.46%  
Minimum | Variable rate debt            
Debt Instrument [Line Items]            
Percentage bearing variable interest (as percent) 1.29%     1.29% 1.29%  
Maximum | Three Fixed-Rate Secured Loans            
Debt Instrument [Line Items]            
Interest rate (as percent) 5.73%     5.73% 5.73%  
Percentage bearing fixed interest (as percent) 4.04%     4.04% 4.04%  
Maximum | Variable rate debt            
Debt Instrument [Line Items]            
Percentage bearing variable interest (as percent) 3.63%     3.63% 3.63%  
Maximum | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate (as percent)         160.00%  
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