Represents the commitment made by an entity to acquire ownership interest in a venture.

No definition available.

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Data Type:	xbrli:monetaryItemType
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- Definition

Represents the commitment made by an entity to acquire a percentage ownership interest in a venture.

+ References

No definition available.

+ Details

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- Definition

Represents the commitment made by an entity to maintain a minimum percentage ownership interest in a venture.

+ References

No definition available.

+ Details

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Namespace Prefix:	stwd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the funded status of the commitments made by an entity to acquire ownership interest in a venture.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the value of mezzanine loan participation and share of earnings held by the managing member or general partner of the LLC or LP.

+ References

No definition available.

+ Details

Name:	stwd_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerMezzaineLoanParticipationAndShareEarnings
Namespace Prefix:	stwd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the purchase of subordinated participation in mezzanine loans.

+ References

No definition available.

+ Details

Name:	stwd_PaymentsToAcquireSubordinatedParticipationInMezzanineLoans
Namespace Prefix:	stwd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of units or percentage investment held by the managing member or general partner of the LLC or LP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Practice Bulletin (PB)

-Number 14

-Paragraph 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

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Other Investments (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended			1 Months Ended	12 Months Ended
	May 31, 2010 Limited liability company for real estate debt management and servicing business	Jan. 31, 2010 Limited liability company for real estate debt management and servicing business	Dec. 31, 2011 Limited liability company for real estate debt management and servicing business	Jun. 30, 2011 Limited liability company for participation in a mezzanine loan	Dec. 31, 2011 Limited liability company for participation in a mezzanine loan
Limited liability company
Commitment to acquire interest in venture	$ 3.4	$ 6.3
Commitment to acquire percentage interest in venture		5.60%
Minimum ownership to be maintained in venture (as a percent)	5.00%
Funded status of commitment to acquire interest in venture			8.0
Ownership percentage acquired in privately-held limited liability company				49.00%
Cost of investment acquired in privately-held limited liability company				25.5
Mezzanine loan participation and share of earning					$ 1.1