Condensed Consolidated Statements of Equity $ in Thousands	Total Starwood Property Trust, Inc. Stockholders' Equity Cumulative Effect, Period of Adoption, Adjustment USD ($)	Total Starwood Property Trust, Inc. Stockholders' Equity USD ($)	Common stock USD ($) shares	Additional Paid-In Capital Cumulative Effect, Period of Adoption, Adjustment USD ($)	Additional Paid-In Capital USD ($)	Treasury Stock USD ($) shares	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment USD ($)	Accumulated Deficit USD ($)	Accumulated Other Comprehensive Income USD ($)	Non-Controlling Interests USD ($)	Cumulative Effect, Period of Adoption, Adjustment USD ($)	USD ($) shares
Balance at Dec. 31, 2019	$ (32,286)	$ 4,700,425	$ 2,874		$ 5,132,532	$ (104,194)	$ (32,286)	$ (381,719)	$ 50,932	$ 436,589	$ (32,286)	$ 5,137,014
Balance (in shares) at Dec. 31, 2019 | shares			287,380,891			5,180,140
Increase (Decrease) in Stockholders' Equity
Proceeds from DRIP Plan		153			153							153
Proceeds from DRIP Plan (in shares) | shares			7,718
Redemption of Class A Units		8,538	$ 4		8,534					(8,538)
Redemption of Class A Units (in shares)			409,712
Equity offering costs		(14)			(14)							(14)
Common stock repurchased		(28,830)				$ (28,830)						(28,830)
Common stock repurchased (in shares) | shares						1,925,421
Share-based compensation		8,800	$ 12		8,788							8,800
Share-based compensation (in shares) | shares			1,195,208
Manager fees paid in stock		9,080	$ 4		9,076							9,080
Manager fee paid in stock (in shares) | shares			355,910
Net income (loss)		(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 | shares			289,349,439			7,105,561
Balance at Dec. 31, 2020	$ (1,536)	4,488,898	$ 2,921	$ (3,755)	5,209,739	$ (138,022)	$ 2,219	(629,733)	43,993	373,678	$ (1,536)	$ 4,862,576
Balance (in shares) at Dec. 31, 2020 | shares			292,091,601			7,448,691						292,091,601
Increase (Decrease) in Stockholders' Equity
Proceeds from DRIP Plan		262			262							$ 262
Proceeds from DRIP Plan (in shares) | shares			12,234
Redemption of Class A Units		1,039	$ 1		1,038					(1,039)
Redemption of Class A Units (in shares)			50,000
Equity offering costs		(22)			(22)							(22)
Share-based compensation		10,310	$ 18		10,292							10,310
Share-based compensation (in shares) | shares			1,814,414
Manager fees paid in stock		7,486	$ 3		7,483							7,486
Manager fee paid in stock (in shares) | shares			332,002
Net income (loss)		111,378						111,378		11,148		122,526
Dividends declared		(138,614)						(138,614)				(138,614)
Other comprehensive loss, net		(2,339)							(2,339)			(2,339)
Contributions from non-controlling interests										2,969		2,969
Distributions to non-controlling interests										(8,833)		(8,833)
Balance at Mar. 31, 2021		$ 4,476,862	$ 2,943		$ 5,225,037	$ (138,022)		$ (654,750)	$ 41,654	$ 377,923		$ 4,854,785
Balance (in shares) at Mar. 31, 2021 | shares			294,300,251			7,448,691						294,300,251