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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Preferred OP Units - Additional Information (Details) - USD ($)
 12 Months Ended 36 Months Ended 240 Months Ended
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 1999
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]            
Denominator for Series A Preferred OP Unit conversion $ 7,500     $ 7,500 $ 7,500  
Common Shares            
Class of Stock [Line Items]            
Issuance of common shares, net of issuance costs (in Shares)   12,961,000        
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) 3,329,640 3,308,875   3,329,640 3,329,640 3,328,873
Preferred OP Units            
Class of Stock [Line Items]            
Issuance of common shares, net of issuance costs (in Shares) 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)       5,000    
Units converted from Preferred OP Units (in shares)       17,165    
Series C Preferred Stock | Operating Partnership, as General Partner or Managing Member            
Class of Stock [Line Items]            
Series A Preferred OP Units (in shares) 136,593 136,593   136,593 136,593 136,593