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Summary of Quarterly Financial Information (Unaudited) (Parenthetical) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) property | Sep. 30, 2019 USD ($) property | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2018 USD ($) property | Dec. 31, 2019 USD ($) property | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Interim Period Costs Not Allocable [Line Items] |  |  |  |  |  |  |  |
Impairment charges |  | $ 300 | $ 1,400 |  |  | $ 1,721 |  | $ 14,455
Number of retail properties | property | 186 |  |  |  |  | 186 |  |
Deferred gain on tax credits |  | 1,400 |  |  |  | $ 5,034 |  |
Revenues revised to reflect the reclassification of credit losses |  |  | $ 800 | $ 800 |  |  | $ 2,500 |
Disposed of by sale |  |  |  |  |  |  |  |
Interim Period Costs Not Allocable [Line Items] |  |  |  |  |  |  |  |
Gain on disposition | $ 16,300 | $ 12,100 |  |  | $ 5,100 |  |  |
Number of retail properties | property |  | 2 |  |  |  |  |  |
Disposed of by sale | Fund IV |  |  |  |  |  |  |  |
Interim Period Costs Not Allocable [Line Items] |  |  |  |  |  |  |  |
Number of retail properties | property |  | 1 |  |  | 2 |  |  |
Disposed of by sale | Fund III |  |  |  |  |  |  |  |
Interim Period Costs Not Allocable [Line Items] |  |  |  |  |  |  |  |
Number of retail properties | property |  | 1 |  |  |  |  |  |
Disposed of by sale | Noncontrolling Interests |  |  |  |  |  |  |  |
Interim Period Costs Not Allocable [Line Items] |  |  |  |  |  |  |  |
Gain on disposition |  |  |  |  | $ 3,900 |  |  |
Operating Partnership, as General Partner or Managing Member |  |  |  |  |  |  |  |
Interim Period Costs Not Allocable [Line Items] |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  | $ 400 |  |
Operating Partnership, as General Partner or Managing Member | Disposed of by sale |  |  |  |  |  |  |  |
Interim Period Costs Not Allocable [Line Items] |  |  |  |  |  |  |  |
Gain on disposition | $ 16,700 | $ 2,800 |  |  |  |  |  |

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