Condensed Consolidated Statements of Equity - USD ($) $ in Thousands	Total Starwood Property Trust, Inc. Stockholders' Equity 2023 Notes	Total Starwood Property Trust, Inc. Stockholders' Equity 2018 Notes	Total Starwood Property Trust, Inc. Stockholders' Equity	Common stock	Additional Paid-In Capital 2023 Notes	Additional Paid-In Capital 2018 Notes	Additional Paid-In Capital	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive Income	Non-Controlling Interests	2023 Notes	2018 Notes	Total
Balance at Dec. 31, 2015			$ 4,140,316	$ 2,410			$ 4,192,844	$ (72,381)	$ (12,286)	$ 29,729	$ 30,627			$ 4,170,943
Balance (in shares) at Dec. 31, 2015				241,044,775				3,553,996
Increase (Decrease) in Stockholders' Equity
Proceeds from DRIP Plan			82				82							82
Proceeds from DRIP Plan (in shares)				4,411
Common stock repurchased			(19,723)					$ (19,723)						$ (19,723)
Common stock repurchased (in shares)								1,052,889						1,052,889
Share-based compensation			7,067	$ 6			7,061							$ 7,067
Share-based compensation (in shares)				563,503
Manager incentive fee paid in stock			10,923	$ 6			10,917							10,923
Manager incentive fee paid in stock (in shares)				606,166
Net income			26,657						26,657		389			27,046
Dividends declared, $0.48 per share			(114,572)						(114,572)					(114,572)
Other comprehensive income, net			3,728							3,728				3,728
VIE non-controlling interests											(633)			(633)
Contributions from non-controlling interests											6,584			6,584
Distribution to non-controlling interests											(582)			(582)
Balance at Mar. 31, 2016			4,054,478	$ 2,422			4,210,904	$ (92,104)	(100,201)	33,457	36,385			4,090,863
Balance (in shares) at Mar. 31, 2016				242,218,855				4,606,885
Balance at Dec. 31, 2016			4,522,274	$ 2,639			4,691,180	$ (92,104)	(115,579)	36,138	37,799			$ 4,560,073
Balance (in shares) at Dec. 31, 2016				263,893,806				4,606,885						263,893,806
Increase (Decrease) in Stockholders' Equity
Proceeds from DRIP Plan			183				183							$ 183
Proceeds from DRIP Plan (in shares)				8,129
Equity offering costs			(12)				(12)							$ (12)
Common stock repurchased (in shares)														0
Equity component of Convertible Senior Notes issuance	$ 3,755				$ 3,755							$ 3,755
Equity component of Convertible Senior Notes repurchase		$ (18,105)				$ (18,105)							$ (18,105)
Share-based compensation			3,159	$ 5			3,154							$ 3,159
Share-based compensation (in shares)				514,379
Manager incentive fee paid in stock			9,547	$ 4			9,543							9,547
Manager incentive fee paid in stock (in shares)				418,016
Net income			102,358						102,358		496			102,854
Dividends declared, $0.48 per share			(125,479)						(125,479)					(125,479)
Other comprehensive income, net			3,929							3,929				3,929
VIE non-controlling interests											5,177			5,177
Distribution to non-controlling interests											(1,726)			(1,726)
Balance at Mar. 31, 2017			$ 4,501,609	$ 2,648			$ 4,689,698	$ (92,104)	$ (138,700)	$ 40,067	$ 41,746			$ 4,543,355
Balance (in shares) at Mar. 31, 2017				264,834,330				4,606,885						264,834,330