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Mortgage and Other Indebtedness, Net - Narrative (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) associated_center mall subsidiary mortgage_note_receivable | Dec. 31, 2018 USD ($) unsecured_term_loan | Jan. 31, 2019 USD ($) | Jan. 01, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |
Number of malls securing the credit facility | mall | 17 |  |  |
Number of associated centers securing the credit facility | associated_center | 3 |  |  |
Number of wholly owned subsidiaries | subsidiary | 36 |  |  |
Ownership interest in guarantor subsidiaries by Operating Partnership (as a percent) | 100.00% |  |  |
Principal maturities for remainder of fiscal year | $ 217,655,000 |  |  |
Weighted-average maturity period | 4 years 5 months | 3 years 8 months |  |
Unsecured lines of credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of debt instruments | unsecured_term_loan |  | 3 |  |
Maximum borrowing capacity |  | $ 1,100,000,000 |  |
Variable-rate debt | $ 390,000,000 |  |  |
Unsecured term loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total Outstanding |  | $ 695,000,000 | $ 500,000,000 |
Number of debt instruments | unsecured_term_loan |  | 3 |  |
Non-recourse loans on operating properties |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total Outstanding | 163,476,000 |  |  |
Default minimum of debt instrument | $ 50,000,000 |  |  |
Secured Debt | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total Outstanding |  |  |  | $ 1,185,000,000
Interest rate (as a percent) | 4.74% |  |  |
Quarterly installment payments on debt |  |  |  | 35,000,000
Secured Debt | Line of Credit | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Annual facility fee (as a percent) | 0.25% |  |  |
Secured Debt | Line of Credit | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Annual facility fee (as a percent) | 0.35% |  |  |
Secured Debt | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total Outstanding |  |  |  | 685,000,000
Secured Debt | Unsecured term loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total Outstanding |  |  |  | 500,000,000
LIBOR | Unsecured Term Loan 1 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 2.25% |  |  |
Guarantor Subsidiaries |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of malls securing the credit facility | mall | 17 |  |  |
Number of associated centers securing the credit facility | associated_center | 3 |  |  |
Number of wholly owned subsidiaries | subsidiary | 36 |  |  |
Number of malls not classified as collateral for the secured credit facility | mall | 5 |  |  |
Number of associated centers not classified as collateral for the secured credit facility | associated_center | 2 |  |  |
Number of mortgage notes receivable not classified as collateral for the secured credit facility | mortgage_note_receivable | 4 |  |  |
Principal maturities for remainder of fiscal year | $ 71,187,000 |  |  |
Weighted-average maturity period | 2 years 1 month 10 days | 1 year 29 days |  |
Guarantor Subsidiaries | Secured Debt | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total Outstanding |  |  |  | $ 1,185,000

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