Condensed Consolidated Statements of Equity - USD ($) $ in Thousands	Total Starwood Property Trust, Inc. Stockholders' Equity	Common stock	Additional Paid-In Capital	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive Income	Non-Controlling Interests	Total
Balance at Dec. 31, 2017	$ 4,478,414	$ 2,660	$ 4,715,246	$ (92,104)	$ (217,312)	$ 69,924	$ 100,787	$ 4,579,201
Balance (in shares) at Dec. 31, 2017		265,983,309		4,606,885
Increase (Decrease) in Stockholders' Equity
Proceeds from DRIP Plan	314		314					314
Proceeds from DRIP Plan (in shares)		14,982
Equity offering costs	(17)		(17)					(17)
Common stock repurchased	(12,090)			$ (12,090)				$ (12,090)
Common stock repurchased (in shares)				573,255				573,255
Share-based compensation	10,605	$ 8	10,597					$ 10,605
Share-based compensation (in shares)		773,822
Manager incentive fee paid in stock	15,798	$ 7	15,791					15,798
Manager incentive fee paid in stock (in shares)		769,712
Net income	209,162				209,162		12,722	221,884
Dividends declared	(252,612)				(252,612)			(252,612)
Other comprehensive loss, net	(1,790)					(1,790)		(1,790)
VIE non-controlling interests							976	976
Contributions from non-controlling interests							375,292	375,292
Distributions to non-controlling interests	(2,962)		(2,962)				(234,589)	(237,551)
Sale of controlling interest in majority owned property asset							(319)	(319)
Balance at Jun. 30, 2018	4,444,822	$ 2,675	4,738,969	$ (104,194)	(260,762)	68,134	254,869	4,699,691
Balance (in shares) at Jun. 30, 2018		267,541,825		5,180,140
Balance at Mar. 31, 2018	4,458,532	$ 2,671	4,728,183	$ (104,194)	(243,438)	75,310	246,155	4,704,687
Balance (in shares) at Mar. 31, 2018		267,135,302		5,180,140
Increase (Decrease) in Stockholders' Equity
Proceeds from DRIP Plan	155		155					155
Proceeds from DRIP Plan (in shares)		7,331
Equity offering costs	(17)		(17)					(17)
Share-based compensation	5,837	$ 2	5,835					5,837
Share-based compensation (in shares)		175,121
Manager incentive fee paid in stock	4,815	$ 2	4,813					4,815
Manager incentive fee paid in stock (in shares)		224,071
Net income	109,230				109,230		7,860	117,090
Dividends declared	(126,554)				(126,554)			(126,554)
Other comprehensive loss, net	(7,176)					(7,176)		(7,176)
VIE non-controlling interests							407	407
Contributions from non-controlling interests							8,601	8,601
Distributions to non-controlling interests							(8,154)	(8,154)
Balance at Jun. 30, 2018	4,444,822	$ 2,675	4,738,969	$ (104,194)	(260,762)	68,134	254,869	4,699,691
Balance (in shares) at Jun. 30, 2018		267,541,825		5,180,140
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				280,839,692
Increase (Decrease) in Stockholders' Equity
Proceeds from DRIP Plan	379		379					$ 379
Proceeds from DRIP Plan (in shares)		17,136
Redemption of Class A Units for common stock	16,373	$ 8	16,365				(16,373)	16,373
Redemption of Class A Units for common stock (in shares)		754,345
Equity offering costs	(8)		(8)					(8)
Conversion of 2019 Convertible Notes	67,562	$ 36	67,526					67,562
Conversion of 2019 Convertible Notes (Shares)		3,611,918
Share-based compensation	13,388	$ 7	13,381					13,388
Share-based compensation (in shares)		732,907
Manager incentive fee paid in stock	10,977	$ 5	10,972					10,977
Manager incentive fee paid in stock (in shares)		495,363
Net income	197,399				197,399		11,555	208,954
Dividends declared	(270,259)				(270,259)			(270,259)
Other comprehensive loss, net	(1,536)					(1,536)		(1,536)
VIE non-controlling interests							(177)	(177)
Contributions from non-controlling interests							4,636	4,636
Distributions to non-controlling interests							(30,854)	(30,854)
Balance at Jun. 30, 2019	4,637,707	$ 2,864	5,103,771	$ (104,194)	(421,858)	57,124	265,544	$ 4,903,251
Balance (in shares) at Jun. 30, 2019		286,451,361		5,180,140				286,451,361
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
Increase (Decrease) in Stockholders' Equity
Proceeds from DRIP Plan	212		212					212
Proceeds from DRIP Plan (in shares)		9,311
Redemption of Class A Units for common stock	16,373	$ 8	16,365				(16,373)
Redemption of Class A Units for common stock (in shares)		754,345
Equity offering costs	(3)		(3)					(3)
Share-based compensation	7,025	$ 1	7,024					7,025
Share-based compensation (in shares)		206,220
Net income	127,016				127,016		5,430	132,446
Dividends declared	(135,321)				(135,321)			(135,321)
Other comprehensive loss, net	1,326					1,326		1,326
VIE non-controlling interests							(40)	(40)
Contributions from non-controlling interests							4,541	4,541
Distributions to non-controlling interests							(23,902)	(23,902)
Balance at Jun. 30, 2019	$ 4,637,707	$ 2,864	$ 5,103,771	$ (104,194)	$ (421,858)	$ 57,124	$ 265,544	$ 4,903,251
Balance (in shares) at Jun. 30, 2019		286,451,361		5,180,140				286,451,361