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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Loss - Preferred OP Units - Additional Information (Details) - $ / shares | 3 Months Ended | 9 Months Ended | 12 Months Ended | 57 Months Ended | 261 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2016 | Dec. 31, 1999 | Sep. 30, 2020 | Sep. 30, 2020
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Denominator for Series A Preferred OP Unit conversion |  | $ 7.50 |  |  |  |  | $ 7.50 | $ 7.50
Common Shares |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Issuance of common shares, net of issuance costs (in Shares) | 2,149,000 |  | 4,816,000 |  |  |  |  |
Gotham Plaza | Common Shares |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Issuance of common shares, net of issuance costs (in Shares) |  |  |  |  | 442,478 |  |  |
Preferred quarterly distribution per share price |  |  |  |  | $ 0.9375 |  |  |
Number of convertible units if share price below $28.80 (in shares) |  |  |  |  | 3.4722 |  |  |
Number of convertible units if share price above $35.20 (in shares) |  |  |  |  | 2.8409 |  |  |
Operating Partnership, as General Partner or Managing Member |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Series A Preferred OP Units (in shares) | 3,306,879 | 3,101,958 | 3,306,879 |  |  |  | 3,101,958 | 3,101,958
Preferred OP Units |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Issuance of common shares, net of issuance costs (in Shares) |  | 0 |  | 0 |  |  |  |
Preferred OP Units | Gotham Plaza |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Issuance of common shares, net of issuance costs (in Shares) |  |  |  |  | 141,593 |  |  |
Share price (in dollars per share) |  |  |  |  | $ 100.00 |  |  |
Preferred OP Units | Gotham Plaza | Minimum |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Share price at conversion date |  |  |  |  | 28.80 |  |  |
Preferred OP Units | Gotham Plaza | Maximum |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Share price at conversion date |  |  |  |  | $ 35.20 |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Issuance of common shares, net of issuance costs (in Shares) |  |  |  |  |  | 1,580 |  |
Preferred stock, stated value per unit |  | $ 1,000 |  |  |  |  | $ 1,000 | $ 1,000
Per unit conversion amount, Series A Preferred OP Units (in dollars per unit) |  | $ 22.50 |  |  |  |  | $ 22.50 | $ 22.50
Per unit conversion annual rate, Preferred OP Units |  | 9.00% |  |  |  |  | 9.00% | 9.00%
Number of preferred OP Units converted (in shares) |  |  |  |  |  |  |  | 1,392
Units converted from Preferred OP Units (in shares) |  |  |  |  |  |  |  | 185,600
Series A Preferred Stock | Operating Partnership, as General Partner or Managing Member |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Series A Preferred OP Units (in shares) | 188 | 188 | 188 |  |  |  | 188 | 188
Series C Preferred Stock | Gotham Plaza |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Number of preferred OP Units converted (in shares) |  |  |  |  |  |  | 15,000 |
Units converted from Preferred OP Units (in shares) |  |  |  |  |  |  | 51,887 |
Series C Preferred Stock | Operating Partnership, as General Partner or Managing Member |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Series A Preferred OP Units (in shares) | 136,593 | 126,593 | 136,593 |  |  |  | 126,593 | 126,593

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