Condensed Consolidated Statements of Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Total Starwood Property Trust, Inc. Stockholders' Equity	Common stock	Additional Paid-In Capital	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Non-Controlling Interests
Balance at Dec. 31, 2011	$ 1,765,147	$ 1,759,488	$ 938	$ 1,828,319	$ (10,642)	$ (55,129)	$ (3,998)	$ 5,659
Balance (in shares) at Dec. 31, 2011			93,811,351		625,850
Increase (Decrease) in Stockholders' Equity
Proceeds from public offering of common stock	457,321	457,321	230	457,091
Proceeds from public offering of common stock (in shares)			23,000,000
Equity offering costs	(2,250)	(2,250)		(2,250)
Stock-based compensation	12,296	12,296	6	12,290
Stock-based compensation (in shares)			584,427
Manager incentive fee paid in stock	2,522	2,522	1	2,521
Manager incentive fee paid in stock (in shares)			120,423
Net income	145,249	144,861				144,861		388
Dividends declared, $1.36 and $1.32 per share for period ended September 30, 2013 and 2012, respectively	(144,670)	(144,670)				(144,670)
Other comprehensive income (loss), net	66,181	66,181					66,181
Distribution to non-controlling interests	(558)							(558)
Balance at Sep. 30, 2012	2,301,238	2,295,749	1,175	2,297,971	(10,642)	(54,938)	62,183	5,489
Balance (in shares) at Sep. 30, 2012			117,516,201		625,850
Balance at Dec. 31, 2012	2,797,205	2,719,346	1,361	2,721,353	(10,642)	(72,401)	79,675	77,859
Balance (in shares) at Dec. 31, 2012	136,125,356		136,125,356		625,850
Increase (Decrease) in Stockholders' Equity
Proceeds from public offering of common stock	1,513,519	1,513,519	593	1,512,926
Proceeds from public offering of common stock (in shares)			59,225,000
Equity offering costs	(955)	(955)		(955)
Convertible senior notes	48,502	48,502		48,502
Stock-based compensation	12,870	12,870	5	12,865
Stock-based compensation (in shares)			523,731
Manager incentive fee paid in stock	367	367		367
Manager incentive fee paid in stock (in shares)			13,188
Net income	218,363	214,239				214,239		4,124
Dividends declared, $1.36 and $1.32 per share for period ended September 30, 2013 and 2012, respectively	(227,177)	(227,177)				(227,177)
Other comprehensive income (loss), net	(10,388)	(10,388)					(10,388)
VIE non-controlling interests	(1,067)							(1,067)
Non-controlling interests assumed through LNR acquisition	8,705							8,705
Contribution from non-controlling interests	1,399							1,399
Distribution to non-controlling interests	(47,914)							(47,914)
Balance at Sep. 30, 2013	$ 4,313,429	$ 4,270,323	$ 1,959	$ 4,295,058	$ (10,642)	$ (85,339)	$ 69,287	$ 43,106
Balance (in shares) at Sep. 30, 2013	195,887,275		195,887,275		625,850