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Mortgage and Other Indebtedness - Additional Information (Details) |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Oct. 25, 2018 USD ($) extension | Sep. 30, 2019 USD ($) extension | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Apr. 24, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Amortization of debt issuance costs |  |  | $ 2,128,000 | $ 2,220,000 |  |
Long-term debt | $ 1,198,584,000 |  | 1,198,584,000 |  | $ 1,543,301,000 |
Letters of credit outstanding, amount | 2,000,000.0 |  | 2,000,000.0 |  |  |
Letters of credit outstanding, amount advanced | 0 |  | 0 |  |  |
Value in unencumbered asset pool | 1,400,000,000 |  | 1,400,000,000 |  |  |
Loan proceeds |  |  | 75,000,000 | 127,000,000 |  |
Repayments of long-term debt |  |  | 418,263,000 | 244,991,000 |  |
Percentage bearing fixed interest, amount | 900,000,000 |  | 900,000,000 |  |  |
Percentage bearing variable interest, amount | 323,000,000.0 |  | 323,000,000.0 |  |  |
Scheduled principal payments |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of long-term debt |  |  | $ 3,500,000 |  |  |
Three Fixed-Rate Secured Loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of retired fixed-rate secured loans |  |  | 12 |  |  |
Fixed-rate secured loans retired |  |  | $ 199,200,000 |  |  |
Long-term debt, fair value | 900,000,000 |  | 900,000,000 |  |  |
Variable rate debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, fair value | 322,700,000 |  | 322,700,000 |  |  |
Term Loans | Unsecured Term Loans, Maturing July 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | 200,000,000 |  | 200,000,000 |  |  |
Long-term debt | 95,000,000 |  | 95,000,000 |  |  |
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] |  |  |  |  |  |
Long-term debt | 545,711,000 |  | 545,711,000 |  | 545,136,000 |
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 |  |  |
Long-term debt | (2,882,000) |  | $ (2,882,000) |  | 41,804,000 |
Line of credit facility, option to increase maximum borrowing capacity | 1,200,000,000 |  | 1,200,000,000 |  |  |
Long-term line of credit | 0 |  | 0 |  |  |
Line of credit facility, remaining borrowing capacity | $ 580,000,000.0 |  | 580,000,000.0 |  |  |
Loan proceeds |  |  | 45,000,000.0 |  |  |
Repayment on credit facility |  |  | $ 120,600,000 |  |  |
London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (as percent) | 2.02% |  |  |  |  |
Minimum | Three Fixed-Rate Secured Loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (as percent) | 3.78% |  | 3.78% |  |  |
Percentage bearing fixed interest (as percent) | 3.28% |  | 3.28% |  |  |
Minimum | Variable rate debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Percentage bearing variable interest (as percent) | 3.12% |  | 3.12% |  |  |
Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (as percent) |  |  | 150.00% |  |  |
Maximum | Three Fixed-Rate Secured Loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (as percent) | 6.78% |  | 6.78% |  |  |
Percentage bearing fixed interest (as percent) | 3.87% |  | 3.87% |  |  |
Maximum | Variable rate debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Percentage bearing variable interest (as percent) | 3.37% |  | 3.37% |  |  |
Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate (as percent) |  |  | 160.00% |  |  |
KRG, LP |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 1,198,584,000 |  | $ 1,198,584,000 |  | 1,543,301,000 |
Loan proceeds |  |  | 75,000,000 | 127,000,000 |  |
Repayments of long-term debt |  |  | 418,263,000 | $ 244,991,000 |  |
KRG, LP | Revolving credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | $ 600,000,000
KRG, LP | Unsecured term loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 200,000,000 |
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 |  |  |  |
Pan Am Plaza Garage | Revolving credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan proceeds |  |  | $ 30,000,000.0 |  |  |

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