Stockholders' Equity and Non-Controlling Interests - Non-Vested Shares (Details)	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Non-Vested Shares and Share Equivalents activity
Balance at the beginning of the period (in shares)	2,718,767
Granted (in shares)	965,847
Vested (in shares)	(704,042)
Forfeited (in shares)	(314)
Balance at the end of the period (in shares)	2,980,258
Weighted Average Grant Date Fair Value (per share)
Balance at the beginning of period (in dollars per share) | $ / shares	$ 22.74
Granted (in dollars per share) | $ / shares	10.77
Vested (in dollars per share) | $ / shares	22.28
Forfeited (in dollars per share) | $ / shares	21.31
Balance at the end of period (in dollars per share) | $ / shares	$ 18.97
Starwood Property Trust, Inc. Equity Plan
Non-Vested Shares and Share Equivalents activity
Balance at the beginning of the period (in shares)	1,413,170
Granted (in shares)	965,847
Vested (in shares)	(474,367)
Forfeited (in shares)	(314)
Balance at the end of the period (in shares)	1,904,336
Starwood Property Trust, Inc. Manager Equity Plan
Non-Vested Shares and Share Equivalents activity
Balance at the beginning of the period (in shares)	1,305,597
Vested (in shares)	(229,675)
Balance at the end of the period (in shares)	1,075,922