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Redeemable Noncontrolling Interests in Operating Partnership (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2017
Apr. 30, 2017
Oct. 31, 2016
Jul. 27, 2015
May 31, 2015
Mar. 31, 2015
Noncontrolling Interest [Line Items]                  
Redeemable noncontrolling interests in operating partnership $ 46,627,000 $ 59,544,000              
Redemption value adjustments 8,843,000 3,691,000 $ 17,444,000            
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable 2,038,000 1,899,000 (393,000)            
Cash distributions declared 2,800,000 2,300,000 2,200,000            
Units redeemed value $ (2,181,000) $ (1,584,000) $ (63,343,000)            
Noncontrolling interest percent 25.00% 25.00%              
Common units redemption (in shares)     100,000            
Common units redemption     $ 1,600,000            
Summary of the activity of the operating partnership units                  
Units outstanding at beginning of year (in shares) 4,943,000 4,375,000 8,955,000            
Units redeemed for shares of common stock (in shares) (194,000) (137,000) (4,245,000)            
Units redeemed for cash of $5,856 in 2015 (in shares) 0 0 (345,000)            
Units outstanding at end of year (in shares) 4,790,000 4,943,000 4,375,000            
Units convertible/redeemable at end of year (in shares) 4,028,000 4,083,000 3,967,000            
Long Term Incentive Plan Units [Member]                  
Noncontrolling Interest [Line Items]                  
Vesting period 3 years                
Units issued (in shares) 1,100,000                
Units which not have reached full economic parity with common units (in shares)       6,000 141,000     6,000 3,000
Unamortized cost $ 1,100,000                
Unamortized cost, period of recognition 2 years 3 months 18 days                
Units redeemed value     $ 5,856,000            
Summary of the activity of the operating partnership units                  
Units issued (in shares) 149,000 4,000 10,000            
Long Term Incentive Plan Units [Member] | Advisory Services Fee [Member]                  
Noncontrolling Interest [Line Items]                  
Allocated compensation expense $ 405,000 $ 1,400,000 $ 1,300,000            
Long Term Incentive Plan Units [Member] | Corporate General and Administrative Expense [Member]                  
Noncontrolling Interest [Line Items]                  
Allocated compensation expense $ 64,000 $ 44,000 $ 101,000            
Performance Long Term Incentive Plan Units [Member]                  
Noncontrolling Interest [Line Items]                  
Outstanding (in shares) 593,000                
Forfeited (in shares) 389,000 0 0            
Units which not have reached full economic parity with common units (in shares)         281,000 312,000      
Unamortized cost $ 799,000                
Unamortized cost, period of recognition 2 years                
Summary of the activity of the operating partnership units                  
Units issued (in shares) 281,000 701,000 0            
Forfeited (in shares) (389,000) 0 0            
Performance Long Term Incentive Plan Units [Member] | Advisory Services Fee [Member]                  
Noncontrolling Interest [Line Items]                  
Allocated compensation expense $ 1,600,000 $ 975,000 $ 0            
Operating Partnership Units [Member]                  
Noncontrolling Interest [Line Items]                  
Redemption/conversion of operating partnership units (in shares) 194,000 137,000 345,000            
Units redeemed value $ 1,800,000 $ 1,900,000 $ 5,900,000            
Ashford Prime OP [Member]                  
Noncontrolling Interest [Line Items]                  
Redemption value adjustments $ 0 $ 8,900,000              
Noncontrolling interest percent 11.43% 13.90%              
Ashford Hospitality Trust, Inc. [Member]                  
Summary of the activity of the operating partnership units                  
Distribution of shares (in shares)             4,100,000    
Fair value at redemption             $ 61,700,000    
Interest in operating partnership             0.00%    
Minimum [Member] | Performance Long Term Incentive Plan Units [Member]                  
Noncontrolling Interest [Line Items]                  
Award performance target 0.00%                
Maximum [Member] | Performance Long Term Incentive Plan Units [Member]                  
Noncontrolling Interest [Line Items]                  
Award performance target 200.00%