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v3.20.2

Commitments and Contingencies - Additional Information (Details) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2020 ft² | Feb. 16, 2018 USD ($) | Nov. 23, 2014 ft²
Other Commitments [Line Items] |  |  |
Area of office properties | ft² | 13,100,000 |  |
Minimum [Member] | New York State Division Of Taxation And Finance [Member] |  |  |
Other Commitments [Line Items] |  |  |
Loss Contingency, Estimate of Possible Loss | $ |  | $ 0 |
Maximum [Member] | New York State Division Of Taxation And Finance [Member] |  |  |
Other Commitments [Line Items] |  |  |
Loss Contingency, Estimate of Possible Loss | $ |  | $ 45,500,000 |
718 Fifth Avenue [Member] |  |  |
Other Commitments [Line Items] |  |  |
Percentage of tenancy-in-common interest in property |  |  | 50.00%
Put right notice period | 12 months |  |
712 Fifth Avenue [Member] |  |  |
Other Commitments [Line Items] |  |  |
Percentage of ownership interest in new joint venture | 50.00% |  |
Owned by Affiliate [Member] | 718 Fifth Avenue [Member] | Third Party Affiliate [Member] |  |  |
Other Commitments [Line Items] |  |  |
Percentage of ownership interest in new joint venture |  |  | 25.00%
Owned by Affiliate [Member] | Parent Company [Member] | Put Right Exercised [Member] | 718 Fifth Avenue [Member] |  |  |
Other Commitments [Line Items] |  |  |
Pre IPO ownership percentage | 25.00% |  |
Owned by Affiliate [Member] | Retail Type Space [Member] | 718 Fifth Avenue [Member] |  |  |
Other Commitments [Line Items] |  |  |
Area of office properties | ft² |  |  | 19,050

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