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Investment in Unconsolidated Real Estate Ventures - Textual (Details) $ in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 02, 2021 USD ($) | Mar. 31, 2021 USD ($) a ft² property investment apartment | Mar. 31, 2020 USD ($) | Feb. 02, 2021 ft² | Feb. 02, 2021 a | Feb. 02, 2021 | Dec. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of properties | property |  | 81 |  |  |  |  |
Investment in Real Estate Ventures |  | $ 433,046 |  |  |  |  | $ 401,327
Accounts receivable |  | 14,665 |  |  |  |  | 13,536
Investment in joint venture |  | 415,823 |  |  |  |  | 389,811
3025 JFK Venture |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Area of land (in acres) |  |  |  | 1 | 1 |  |
Equity method investment, ownership percentage |  |  |  |  |  | 55.00% |
Lease agreement term | 99 years |  |  |  |  |  |
Investment in joint venture | $ 34,800 | 34,800 |  |  |  |  |
Area of building to be constructed | ft² |  |  |  | 570,000 |  |  |
Estimated project cost | 287,000 |  |  |  |  |  |
Ownership interest held by partner |  |  |  |  |  | 45.00% |
Joint venture, funding committed by other party | $ 45,000 |  |  |  |  |  |
Joint venture, funding committed |  | 20,200 |  |  |  |  |
Construction loan amount |  | $ 187,000 |  |  |  |  |
Minimum |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 15.00% |  |  |  |  |
Maximum |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 70.00% |  |  |  |  |
Real Estate Venture |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Accounts receivable |  | $ 2,100 |  |  |  |  | $ 1,200
Real Estate Venture | Management Fees |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 2,000 | $ 1,100 |  |  |  |
Real Estate Venture | Leasing Commission Income |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Service and other revenue |  | 1,300 | $ 400 |  |  |  |
Unconsolidated Real Estate Ventures |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investment in Real Estate Ventures |  | $ 415,800 |  |  |  |  |
Unconsolidated Real Estate Ventures | Office properties |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | investment |  | 5 |  |  |  |  |
Rentable area (in square feet) | ft² |  | 8,400,000 |  |  |  |  |
Unconsolidated Real Estate Ventures | Unconsolidated Properties |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of properties | property |  | 10 |  |  |  |  |
Number of properties with negative investment balances | property |  | 1 |  |  |  |  |
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 |  |  |  |  |
Area of land (in acres) | a |  | 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 |  |  |  |  |
Area of land (in acres) | a |  | 1.0 |  |  |  |  |
Unconsolidated Real Estate Ventures | Mixed Use Tower |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | investment |  | 1 |  |  |  |  |
Rentable area (in square feet) | ft² |  | 200,000 |  |  |  |  |
Number of apartment units (in units) | apartment |  | 250 |  |  |  |  |
Unconsolidated Real Estate Ventures | Residential Tower |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | investment |  | 1 |  |  |  |  |
Number of apartment units (in units) | apartment |  | 321 |  |  |  |  |
Other Liabilities | Unconsolidated Real Estate Ventures |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investment in Real Estate Ventures |  | $ (17,200) |  |  |  |  |

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