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			177				177							177
Proceeds from DRIP Plan (in shares)				9,163
Common stock repurchased			(19,723)					$ (19,723)						$ (19,723)
Common stock repurchased (in shares)								1,052,889						1,052,889
Share-based compensation			14,660	$ 9			14,651							$ 14,660
Share-based compensation (in shares)				876,674
Manager incentive fee paid in stock			13,223	$ 8			13,215							13,223
Manager incentive fee paid in stock (in shares)				723,249
Net income			138,130						138,130		987			139,117
Dividends declared, $0.96 per share			(229,217)						(229,217)					(229,217)
Other comprehensive income, net			2,898							2,898				2,898
VIE non-controlling interests											(52)			(52)
Contributions from non-controlling interests											10,417			10,417
Distribution to non-controlling interests											(2,350)			(2,350)
Balance at Jun. 30, 2016			4,060,464	$ 2,427			4,220,887	$ (92,104)	(103,373)	32,627	39,629			4,100,093
Balance (in shares) at Jun. 30, 2016				242,653,861				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			369				369							$ 369
Proceeds from DRIP Plan (in shares)				16,407
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			8,079	$ 7			8,072							$ 8,079
Share-based compensation (in shares)				709,462
Manager incentive fee paid in stock			12,244	$ 6			12,238							12,244
Manager incentive fee paid in stock (in shares)				541,494
Net income			219,738						219,738		6,349			226,087
Dividends declared, $0.96 per share			(251,022)						(251,022)					(251,022)
Other comprehensive income, net			19,843							19,843				19,843
VIE non-controlling interests											2,737			2,737
Distribution to non-controlling interests											(3,599)			(3,599)
Balance at Jun. 30, 2017			$ 4,517,163	$ 2,652			$ 4,697,497	$ (92,104)	$ (146,863)	$ 55,981	$ 43,286			$ 4,560,449
Balance (in shares) at Jun. 30, 2017				265,161,169				4,606,885						265,161,169