Consolidated Statements of Equity - USD ($) $ in Thousands	Total Starwood Property Trust, Inc. Stockholders' Equity 2019 Notes	Total Starwood Property Trust, Inc. Stockholders' Equity	Common stock 2019 Notes	Common stock	Additional Paid-In Capital 2019 Notes	Additional Paid-In Capital	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive Income	Non-Controlling Interests	2019 Notes	Total
Balance at Dec. 31, 2018		$ 4,603,432		$ 2,808		$ 4,995,156	$ (104,194)	$ (348,998)	$ 58,660	$ 296,757		$ 4,900,189
Balance (in shares) at Dec. 31, 2018				280,839,692			5,180,140
Increase (Decrease) in Stockholders' Equity
Proceeds from DRIP Plan		167				167						167
Proceeds from DRIP Plan (in shares)				7,825
Equity offering costs		(5)				(5)						(5)
Conversion of 2019 Convertible Notes	$ 67,562		$ 36		$ 67,526						$ 67,562
Conversion of 2019 Convertible Notes (Shares)			3,611,918
Share-based compensation		6,363		$ 6		6,357						6,363
Share-based compensation (in shares)				526,687
Manager incentive fee paid in stock		10,977		$ 5		10,972						10,977
Manager incentive fee paid in stock (in shares)				495,363
Net (loss) income		70,383						70,383		6,125		76,508
Dividends declared		(134,938)						(134,938)				(134,938)
Other comprehensive loss, net		(2,862)							(2,862)			(2,862)
VIE non-controlling interests										(137)		(137)
Contributions from non-controlling interests										95		95
Distributions to non-controlling interests										(6,952)		(6,952)
Balance at Mar. 31, 2019		4,621,079		$ 2,855		5,080,173	$ (104,194)	(413,553)	55,798	295,888		4,916,967
Balance (in shares) at Mar. 31, 2019				285,481,485			5,180,140
Balance at Dec. 31, 2019		4,700,425		$ 2,874		5,132,532	$ (104,194)	(381,719)	50,932	436,589		$ 5,137,014
Balance (in shares) at Dec. 31, 2019				287,380,891			5,180,140					287,380,891
Increase (Decrease) in Stockholders' Equity
Proceeds from DRIP Plan		153				153						$ 153
Proceeds from DRIP Plan (in shares)				7,718
Redemption of Class A Units for common stock		8,538		$ 4		8,534				(8,538)		8,538
Redemption of Class A Units for common stock (in shares)				409,712
Equity offering costs		(14)				(14)						(14)
Common stock repurchased		(28,830)					$ (28,830)					$ (28,830)
Common stock repurchased (in shares)							1,925,421					1,925,421
Share-based compensation		8,800		$ 12		8,788						$ 8,800
Share-based compensation (in shares)				1,195,208
Manager incentive fee paid in stock		9,080		$ 4		9,076						9,080
Manager incentive fee paid in stock (in shares)				355,910
Net (loss) income		(66,769)						(66,769)		500		(66,269)
Dividends declared		(135,991)						(135,991)				(135,991)
Other comprehensive loss, net		(15,048)							(15,048)			(15,048)
VIE non-controlling interests										(2,188)		(2,188)
Contributions from non-controlling interests										9,406		9,406
Distributions to non-controlling interests										(66,476)		(66,476)
Balance at Mar. 31, 2020		4,448,058		$ 2,894		$ 5,159,069	$ (133,024)	(616,765)	$ 35,884	$ 369,293		$ 4,817,351
Balance (in shares) at Mar. 31, 2020				289,349,439			7,105,561					289,349,439
Increase (Decrease) in Stockholders' Equity
Cumulative effect of credit loss accounting standard effective January 1, 2020		$ (32,286)						$ (32,286)				$ (32,286)