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Mortgage and Other Indebtedness, Net - Narrative (Details) | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) extension_option loan credit_line | Dec. 31, 2017 | Jun. 04, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |
Weighted-average interest rate (as a percent) |  | 5.04% | 4.74% |
Principal maturities in 2018 |  | $ 411,284,000 |  |
Principal maturities in 2020 |  | $ 661,816,000 |  |
Weighted-average maturity period |  | 3 years 10 months 10 days | 4 years 4 months 24 days |
Unsecured lines of credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of unsecured term loans | credit_line |  | 3 |  |
Variable rate (as a percent) |  | 1.55% |  |
Annual facility fee (as a percent) |  | 0.30% |  |
Aggregate capacity of the three unsecured lines of credit |  | $ 1,100,000,000 |  |
Unsecured lines of credit | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable rate (as a percent) |  | 0.875% |  |
Annual facility fee (as a percent) |  | 0.125% |  |
Unsecured lines of credit | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable rate (as a percent) |  | 1.55% |  |
Annual facility fee (as a percent) |  | 0.30% |  |
Unsecured Term Loan 2 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable rate (as a percent) |  | 1.75% |  |
Face amount of debt instrument |  | $ 350,000,000 |  |
Interest rate (as a percent) |  | 3.85% |  |
Unsecured Term Loan 1 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable rate (as a percent) |  | 2.00% |  |
Face amount of debt instrument |  | $ 300,000,000 |  |
Option extension term of debt instrument |  | 1 year |  |
Interest rate (as a percent) |  | 4.10% |  |
Number of extension options available | extension_option |  | 2 |  |
Unsecured Term Loan 3 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable rate (as a percent) |  | 1.65% |  |
Face amount of debt instrument |  | $ 45,000,000 |  |
Interest rate (as a percent) |  | 3.75% |  |
Operating property loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal maturities in 2018 |  | $ 43,716,000 |  |
Unsecured Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of unsecured term loans | loan |  | 1 |  |
Fixed Rate Interest |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted-average interest rate (as a percent) |  | 5.37% | 5.37% |
Variable Rate Interest |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted-average interest rate (as a percent) |  | 3.95% | 2.90% |
Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of unsecured term loans | loan |  | 3 |  |
Senior Notes Due 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount of debt instrument |  | $ 625,000,000 |  |
Senior Notes Due 2026 | Fixed Rate Interest |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted-average interest rate (as a percent) |  | 5.95% | 5.95% |
Senior Notes Due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount of debt instrument |  | $ 300,000,000 |  |
Senior Notes Due 2024 | Fixed Rate Interest |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted-average interest rate (as a percent) |  | 4.60% | 4.60% |
Unsecured lines of credit | Variable Rate Interest |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted-average interest rate (as a percent) |  | 3.65% | 2.56% |
Non-recourse loans on operating properties |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount of debt instrument |  |  |  | $ 43,716,000
Default minimum of debt instrument |  | $ 50,000,000 |  |
Non-recourse loans on operating properties | Fixed Rate Interest |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted-average interest rate (as a percent) |  | 5.33% | 5.33% |
Non-recourse loans on operating properties | Variable Rate Interest |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted-average interest rate (as a percent) |  | 0.00% | 3.37% |
Recourse loans on operating properties |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Default minimum of debt instrument |  | $ 150,000,000 |  |
Recourse loans on operating properties | Variable Rate Interest |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted-average interest rate (as a percent) |  | 4.73% | 4.00% |
Principal amortization |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal maturities in 2018 |  | $ 17,568,000 |  |
Cary Towne Center | Unsecured Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal maturities in 2018 |  | $ 350,000,000 |  |
Hickory Point Mall |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount financed | $ 27,446,000 |  |  |

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