Segment Data (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues:
Interest income from loans	$ 105,455	$ 74,936	$ 210,365	$ 142,626
Interest income from investment securities	27,620	18,577	57,074	34,817
Servicing fees	32,681	39,135	66,892	39,135
Other revenues	4,994	1,795	8,398	1,874
Total revenues	170,750	134,443	342,729	218,452
Costs and expenses:
Management fees	25,085	16,146	52,906	31,215
Interest expense	37,695	22,648	75,526	40,074
General and administrative	43,094	44,335	89,195	48,373
Business combination costs		13,420		17,616
Acquisition and investment pursuit costs	771	916	1,165	997
Depreciation and amortization	5,154	2,228	9,790	2,228
Loan loss allowance, net	(139)	725	358	755
Other expense	6,026	196	7,715	229
Total costs and expenses	117,686	100,614	236,655	141,487
Income before other income, income taxes and non controlling interests	53,064	33,829	106,074	76,965
Other income:
Income of consolidated VIEs, net	47,028	31,949	103,032	31,949
Change in fair value of servicing rights	(5,523)	2,898	(10,774)	2,898
Change in fair value of investment securities, net	4,959	(1,392)	13,320	(987)
Change in fair value of mortgage loans held-for-sale, net	11,608	458	32,501	458
Earnings from unconsolidated entities	9,563	3,770	9,627	4,511
Gain (loss) on sale of investments, net	10,078	(18)	11,633	13,506
(Loss) gain on derivative financial instruments, net	(9,790)	6,158	(17,656)	22,386
Foreign currency gain (loss), net	3,777	1,580	5,254	(6,085)
OTTI	(797)	(359)	(1,010)	(401)
Other income, net	692	39	710	39
Total other income	71,595	45,083	146,637	68,274
Income from continuing operations before income taxes	124,659	78,912	252,711	145,239
Income tax provision	(4,277)	(11,343)	(9,897)	(11,958)
Income from continuing operations	120,382	67,569	242,814	133,281
Loss from discontinued operations, net of tax		(6,058)	(1,551)	(8,346)
Net income	120,382	61,511	241,263	124,935
Net income attributable to non-controlling interests	(2,514)	(1,057)	(2,794)	(2,238)
Net income attributable to Starwood Property Trust, Inc.	117,868	60,454	238,469	122,697
Operating segment
Revenues:
Interest income from loans	105,455	74,936	210,365	142,626
Interest income from investment securities	45,259	25,396	86,556	41,636
Servicing fees	57,987	52,860	114,209	52,860
Other revenues	5,344	2,068	9,021	2,147
Total revenues	214,045	155,260	420,151	239,269
Costs and expenses:
Management fees	25,045	16,128	52,828	31,197
Interest expense	37,695	22,648	75,526	40,074
General and administrative	42,913	44,188	88,828	48,226
Business combination costs		13,420		17,616
Acquisition and investment pursuit costs	771	916	1,165	997
Depreciation and amortization	5,154	2,228	9,790	2,228
Loan loss allowance, net	(139)	725	358	755
Other expense	6,026	196	7,715	229
Total costs and expenses	117,465	100,449	236,210	141,322
Income before other income, income taxes and non controlling interests	96,580	54,811	183,941	97,947
Other income:
Change in fair value of servicing rights	(12,804)	6,114	(24,979)	6,114
Change in fair value of investment securities, net	17,155	6,057	53,951	6,462
Change in fair value of mortgage loans held-for-sale, net	11,608	458	32,501	458
Earnings from unconsolidated entities	8,651	3,966	8,808	4,707
Gain (loss) on sale of investments, net	10,078	(18)	11,633	13,506
(Loss) gain on derivative financial instruments, net	(9,790)	6,158	(17,656)	22,386
Foreign currency gain (loss), net	3,777	1,580	5,254	(6,085)
OTTI	(797)	(359)	(1,010)	(401)
Other income, net	692	39	710	39
Total other income	28,570	23,995	69,212	47,186
Income from continuing operations before income taxes	125,150	78,806	253,153	145,133
Income tax provision	(4,277)	(11,343)	(9,897)	(11,958)
Income from continuing operations	120,873	67,463	243,256	133,175
Loss from discontinued operations, net of tax		(6,058)	(1,551)	(8,346)
Net income	120,873	61,405	241,705	124,829
Net income attributable to non-controlling interests	(3,005)	(951)	(3,236)	(2,132)
Net income attributable to Starwood Property Trust, Inc.	117,868	60,454	238,469	122,697
Operating segment | Real Estate Investment Lending
Revenues:
Interest income from loans	102,892	72,676	204,979	140,366
Interest income from investment securities	15,178	13,638	33,467	29,878
Servicing fees	153		190
Other revenues	108	96	188	175
Total revenues	118,331	86,410	238,824	170,419
Costs and expenses:
Management fees	20,423	13,854	41,778	28,923
Interest expense	31,557	19,941	62,811	37,367
General and administrative	7,921	3,615	15,066	7,653
Business combination costs		13,420		17,616
Acquisition and investment pursuit costs	523	525	735	606
Loan loss allowance, net	(139)	725	358	755
Other expense	66	58	52	91
Total costs and expenses	60,351	52,138	120,800	93,011
Income before other income, income taxes and non controlling interests	57,980	34,272	118,024	77,408
Other income:
Change in fair value of investment securities, net	861	(331)	705	74
Earnings from unconsolidated entities	3,432	1,851	4,972	2,592
Gain (loss) on sale of investments, net	10,078	(18)	11,633	13,506
(Loss) gain on derivative financial instruments, net	(7,610)	(2,001)	(10,398)	14,227
Foreign currency gain (loss), net	4,082	1,647	5,643	(6,018)
OTTI		(359)	(213)	(401)
Other income, net	35		53
Total other income	10,878	789	12,395	23,980
Income from continuing operations before income taxes	68,858	35,061	130,419	101,388
Income tax provision	(443)	(411)	(526)	(1,026)
Income from continuing operations	68,415	34,650	129,893	100,362
Net income	68,415	34,650	129,893	100,362
Net income attributable to non-controlling interests	(3,005)	(951)	(3,236)	(2,132)
Net income attributable to Starwood Property Trust, Inc.	65,410	33,699	126,657	98,230
Operating segment | LNR
Revenues:
Interest income from loans	2,563	2,260	5,386	2,260
Interest income from investment securities	30,081	11,758	53,089	11,758
Servicing fees	57,834	52,860	114,019	52,860
Other revenues	5,236	1,972	8,833	1,972
Total revenues	95,714	68,850	181,327	68,850
Costs and expenses:
Management fees	4,622	2,274	10,259	2,274
Interest expense	6,138	2,707	11,624	2,707
General and administrative	34,992	40,573	73,762	40,573
Acquisition and investment pursuit costs	248	391	430	391
Depreciation and amortization	5,154	2,228	9,790	2,228
Other expense	5,960	138	7,663	138
Total costs and expenses	57,114	48,311	113,528	48,311
Income before other income, income taxes and non controlling interests	38,600	20,539	67,799	20,539
Other income:
Change in fair value of servicing rights	(12,804)	6,114	(24,979)	6,114
Change in fair value of investment securities, net	16,294	6,388	53,246	6,388
Change in fair value of mortgage loans held-for-sale, net	11,608	458	32,501	458
Earnings from unconsolidated entities	5,219	2,115	3,836	2,115
(Loss) gain on derivative financial instruments, net	(2,180)	8,159	(7,258)	8,159
Foreign currency gain (loss), net	(305)	(67)	(389)	(67)
OTTI	(797)		(797)
Other income, net	657	39	657	39
Total other income	17,692	23,206	56,817	23,206
Income from continuing operations before income taxes	56,292	43,745	124,616	43,745
Income tax provision	(3,834)	(10,932)	(9,371)	(10,932)
Income from continuing operations	52,458	32,813	115,245	32,813
Net income	52,458	32,813	115,245	32,813
Net income attributable to Starwood Property Trust, Inc.	52,458	32,813	115,245	32,813
Operating segment | Single Family Residential
Costs and expenses:
Management fees			791
Interest expense			1,091
Total costs and expenses			1,882
Income before other income, income taxes and non controlling interests			(1,882)
Other income:
Income from continuing operations before income taxes			(1,882)
Income from continuing operations			(1,882)
Loss from discontinued operations, net of tax		(6,058)	(1,551)	(8,346)
Net income		(6,058)	(3,433)	(8,346)
Net income attributable to Starwood Property Trust, Inc.		(6,058)	(3,433)	(8,346)
LNR VIEs
Revenues:
Interest income from investment securities	(17,639)	(6,819)	(29,482)	(6,819)
Servicing fees	(25,306)	(13,725)	(47,317)	(13,725)
Other revenues	(350)	(273)	(623)	(273)
Total revenues	(43,295)	(20,817)	(77,422)	(20,817)
Costs and expenses:
Management fees	40	18	78	18
General and administrative	181	147	367	147
Total costs and expenses	221	165	445	165
Income before other income, income taxes and non controlling interests	(43,516)	(20,982)	(77,867)	(20,982)
Other income:
Income of consolidated VIEs, net	47,028	31,949	103,032	31,949
Change in fair value of servicing rights	7,281	(3,216)	14,205	(3,216)
Change in fair value of investment securities, net	(12,196)	(7,449)	(40,631)	(7,449)
Earnings from unconsolidated entities	912	(196)	819	(196)
Total other income	43,025	21,088	77,425	21,088
Income from continuing operations before income taxes	(491)	106	(442)	106
Income from continuing operations	(491)	106	(442)	106
Net income	(491)	106	(442)	106
Net income attributable to non-controlling interests	$ 491	$ (106)	$ 442	$ (106)