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Stockholders' Equity - Equity Incentive Plans (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 31, 2017
May 31, 2015
Jan. 31, 2014
Mar. 31, 2017
Equity Incentive Plans        
Awards granted (in shares)       1,470,469
Starwood Property Trust, Inc. Equity Plan and Manager Equity Plan        
Equity Incentive Plans        
Number of shares available for future grants 800,000     800,000
Starwood Property Trust, Inc. Equity Plan        
Equity Incentive Plans        
Awards granted (in shares)       470,469
Starwood Property Trust, Inc. Manager Equity Plan        
Equity Incentive Plans        
Awards granted (in shares)       1,000,000
Starwood Property Trust, Inc. Manager Equity Plan | Restricted stock units        
Equity Incentive Plans        
Awards granted (in shares) 1,000,000 675,000 2,000,000  
Awards granted, fair value $ 22,240,000 $ 16,511,000 $ 55,420,000  
Award vesting period 3 years 3 years 3 years  
Starwood Property Trust, Inc. Manager Equity Plan | Restricted stock units | Spin off        
Equity Incentive Plans        
Awards granted (in shares)     489,281  
Awards granted, fair value     $ 14,776,000  
Award vesting period     3 years