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Mortgage and Other Indebtedness - Additional Information (Details)
 1 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Oct. 25, 2018
USD ($)
extension
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
extension
Jun. 30, 2019
USD ($)
Apr. 24, 2018
USD ($)
Debt Instrument [Line Items]              
Amortization of debt issuance costs         $ 1,172,000 $ 1,514,000  
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 1,400,000,000   1,400,000,000   1,400,000,000    
Percentage bearing fixed interest, amount 846,700,000   846,700,000   846,700,000    
Percentage bearing variable interest, amount 505,500,000   505,500,000   505,500,000    
Three Fixed-Rate Secured Loans              
Debt Instrument [Line Items]              
Long-term debt, fair value 837,500,000   837,500,000   837,500,000    
Variable rate debt              
Debt Instrument [Line Items]              
Long-term debt, fair value 487,200,000   487,200,000   487,200,000    
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     100,000,000        
Long-term line of credit 200,000,000   200,000,000   200,000,000    
Line of credit facility, remaining borrowing capacity $ 354,200,000   $ 354,200,000   $ 354,200,000    
London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Basis spread on variable rate (as percent) 0.16%            
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) 3.49%   3.49%   3.49%    
Minimum | Variable rate debt              
Debt Instrument [Line Items]              
Percentage bearing variable interest (as percent) 1.28%   1.28%   1.28%    
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) 4.07%   4.07%   4.07%    
Maximum | Variable rate debt              
Debt Instrument [Line Items]              
Percentage bearing variable interest (as percent) 3.64%   3.64%   3.64%    
Maximum | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Basis spread on variable rate (as percent)         160.00%    
KRG, LP | Revolving credit facility              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity             $ 600,000,000
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