Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Loss - Preferred OP Units - Additional Information (Details) - $ / shares	3 Months Ended	6 Months Ended	12 Months Ended		66 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2016	Jun. 30, 2021	Jun. 30, 2020
Class of Stock [Line Items]
Series A Preferred OP Units (in shares)	3,101,958	3,101,958			3,101,958
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)	2,072	2,072
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)						3,101,958
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 OP Units (in shares)	188	188			188	188
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
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)	126,593	126,593			126,593	126,593