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Investment in Unconsolidated Real Estate Ventures - Textual (Details) $ in Thousands, ft² in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) a ft² investment apartment property | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) a ft² investment apartment property | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of properties | property | 94 |  | 94 |  |
Investment in Real Estate Ventures | $ 118,558 |  | $ 118,558 |  | $ 120,294
Accounts receivable | $ 18,823 |  | $ 18,823 |  | 16,363
Minimum |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage | 15.00% |  | 15.00% |  |
Maximum |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage | 70.00% |  | 70.00% |  |
Real Estate Venture |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Accounts receivable | $ 800 |  | $ 800 |  | $ 800
Real Estate Venture | Management Fees |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Service and other revenue | 800 | $ 1,100 | 2,000 | $ 2,200 |
Real Estate Venture | Leasing Commission Income |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Service and other revenue | 200 | $ 300 | 600 | $ 500 |
Unconsolidated Real Estate Ventures |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment in Real Estate Ventures | $ 113,100 |  | $ 113,100 |  |
Unconsolidated Real Estate Ventures | Office properties |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | investment | 3 |  | 3 |  |
Rentable area (in square feet) | ft² | 5.4 |  | 5.4 |  |
Unconsolidated Real Estate Ventures | Unconsolidated Properties |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of properties | property | 7 |  | 7 |  |
Unconsolidated Real Estate Ventures | Land Held For Development |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | investment | 2 |  | 2 |  |
Area of land (in acres) | a | 1.4 |  | 1.4 |  |
Unconsolidated Real Estate Ventures | Land Under Active Development |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | investment | 1 |  | 1 |  |
Area of land (in acres) | a | 1.3 |  | 1.3 |  |
Unconsolidated Real Estate Ventures | Residential Tower |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | investment | 1 |  | 1 |  |
Number of apartment units (in units) | apartment | 321 |  | 321 |  |

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