Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Continuing Operations:
Net income attributable to Starwood Property Trust, Inc.	$ 26,657	$ 120,363
Less: Income attributable to participating shares	(708)	(972)
Basic earnings	25,949	119,391
Continuing Operations:
Basic - Income attributable to STWD common stockholders	26,657	120,363
Less: Income attributable to participating shares	(708)	(972)
Add: Undistributed earnings to participating shares		106
Less: Undistributed earnings reallocated to participating shares		(104)
Diluted earnings	$ 25,949	$ 119,393
Number of Shares:
Basic - Average shares outstanding	236,556	223,541
Effect of dilutive securities - Contingently Issuable Shares (in shares)	121	138
Effect of dilutive securities — Unvested non-participating shares	82
Weighted Average Number of Shares Outstanding, Diluted, Total	236,759	229,032
Basic:
Basic (in dollars per share)	$ 0.11	$ 0.53
Diluted:
Diluted (in dollars per share)	$ 0.11	$ 0.52