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Investments in Unconsolidated Joint Ventures - Summary of Investments and Income from Investments In Unconsolidated Joint Ventures (Parenthetical) (Details) - USD ($) |  | 12 Months Ended
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Jan. 01, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items] |  |  |
Adjustment to investments in unconsolidated joint ventures |  |  | $ 7,086,000
712 Fifth Avenue [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Distributions made in excess of share of earnings recognized negative basis |  | $ 19,648 |
55 Second Street [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Difference between carrying amount of investment and equity |  | 583,000 |
60 Wall Street [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Difference between carrying amount of investment and equity |  | 2,716,000 |
One Steuart Lane [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Difference between carrying amount of investment and equity |  | 974,000 |
One Steuart Lane [Member] | ASU 2017-05 [Member] | RDF [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Adjustment to investments in unconsolidated joint ventures | $ 7,086,000 |  |
Oder-Center, Germany [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Difference between carrying amount of investment and equity |  | $ 4,576,000 |

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