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Preferred Stock and Units - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 23, 2016
Oct. 30, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Nov. 15, 2017
Preferred Units [Line Items]            
Preferred stock, shares authorized     11,000,000   11,000,000  
7.0% Senior Unsecured Notes [Member]            
Preferred Units [Line Items]            
Interest rate on loan           7.00%
Sotherly Hotels LP [Member] | 7.0% Senior Unsecured Notes [Member]            
Preferred Units [Line Items]            
Interest rate on loan   7.00%        
Sotherly Hotels LP [Member] | 8.0% Senior Unsecured Notes [Member]            
Preferred Units [Line Items]            
Interest rate on loan 8.00%          
Sotherly Hotels LP [Member] | 7.875% Series C Cumulative Redeemable Perpetual Preferred Units [Member]            
Preferred Units [Line Items]            
Operating partnership preferred partnership units issued   1,300,000        
Preferred units, dividend rate percentage   7.875% 7.875%   7.875%  
Proceeds from sale of preferred units, net   $ 30.5        
Preferred units, liquidation preference per units     $ 25   $ 25  
Sotherly Hotels LP [Member] | 8% Series B Cumulative Redeemable Perpetual Preferred Units [Member]            
Preferred Units [Line Items]            
Operating partnership preferred partnership units issued 1,610,000          
Preferred units, dividend rate percentage 8.00%   8.00%   8.00%  
Proceeds from sale of preferred units, net $ 37.8          
Preferred units, par value $ 0.01          
Preferred units, liquidation preference per units $ 25.00   $ 25   $ 25  
Preferred dividend distributed     $ 0.50 $ 0.50    
Sotherly Hotels LP [Member] | 7.825% Series C Cumulative Redeemable Perpetual Preferred Units [Member]            
Preferred Units [Line Items]            
Preferred units, dividend rate percentage     7.825%      
Preferred units, liquidation preference per units     $ 25.00      
Preferred dividend distributed     $ 0.004922 $ 0    
8% Series B Cumulative Redeemable Perpetual Preferred Stock [Member]            
Preferred Units [Line Items]            
Preferred stock, shares authorized     11,000,000   11,000,000  
Preferred stock, shares issued 1,610,000   1,610,000   1,610,000  
Preferred stock, shares outstanding     1,610,000   1,610,000  
Proceeds from sale of preferred stock, net $ 37.8          
Preferred stock, dividend rate percentage     8.00%   8.00%  
Preferred stock, liquidation preference per share     $ 25   $ 25  
7.875% Series C Cumulative Redeemable Perpetual Preferred Stock [Member]            
Preferred Units [Line Items]            
Preferred stock, shares authorized     11,000,000   11,000,000  
Preferred stock, shares issued   1,300,000 1,300,000   1,300,000  
Preferred stock, shares outstanding     1,300,000   1,300,000  
Proceeds from sale of preferred stock, net   $ 30.5        
Preferred stock, dividend rate percentage     7.875%   7.875%  
Preferred stock, liquidation preference per share     $ 25   $ 25