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Stockholders' Equity - Equity Incentive Plans (Details) - USD ($)
1 Months Ended 3 Months Ended
May. 31, 2015
Jan. 31, 2014
Mar. 31, 2016
Equity Incentive Plans      
Awards granted (in shares)     343,582
Award vesting period 3 years    
Starwood Property Trust, Inc. Equity Plan and Manager Equity Plan      
Equity Incentive Plans      
Number of shares available for future grants     2,300,000
Starwood Property Trust, Inc. Equity Plan      
Equity Incentive Plans      
Awards granted (in shares)     339,806
Starwood Property Trust, Inc. Manager Equity Plan | Restricted stock units      
Equity Incentive Plans      
Awards granted (in shares) 675,000 2,000,000  
Awards granted, fair value $ 16,511,000 $ 55,420,000  
Award vesting period   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  
Starwood Property Trust, Inc. Non-Executive Director Stock Plan      
Equity Incentive Plans      
Awards granted (in shares)     3,776