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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the extension fee percentage for each year if the overall facility is extended beginning in December 2014.

No definition available.

Name:	stwd_DebtInstrumentExtensionFeePercentageForEachYearIfOverallFacilityIsExtendedInBeginningOfSpecifiedYear
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the maximum amount of the obligation under the repurchase agreement that is guaranteed by the reporting entity.

No definition available.

Name:	stwd_DebtInstrumentMaximumLiabilityGuaranteed
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the maximum amount of the obligation under the repurchase agreement that is guaranteed by the reporting entity, as a percent of the then currently outstanding repurchase price of all purchases assets.

No definition available.

Name:	stwd_DebtInstrumentMaximumPercentageOfLiabilityGuaranteed
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the number of extension options available to the entity to extend the term of the debt instrument.

No definition available.

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

Represents the operating cash flows as maximum percentage of collateral loan receivable for which the entity guarantees 100% of the outstanding repurchase price for all purchased assets.

No definition available.

Name:	stwd_DebtInstrumentOperatingCashFlowsAsPercentageOfCollateralLoanReceivableForWhichTheEntityGuarantees100PercentOfOutstandingRepurchasePriceMaximum
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Data Type:	num:percentItemType
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Period Type:	duration

Represents the percentage of liability guaranteed subject to currently outstanding repurchase price for all the purchased assets.

No definition available.

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

Represents the percentage of liability guaranteed subject to outstanding balance of any individual repurchase transaction.

No definition available.

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

Represents the term of the debt instrument.

No definition available.

Name:	stwd_DebtInstrumentTerm
Namespace Prefix:	stwd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the period by which the term of the debt instrument may be extended under each extension option.

No definition available.

Name:	stwd_DebtInstrumentTermOfExtensionOptions
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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The increase in maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

No definition available.

Name:	stwd_LineOfCreditFacilityIncreaseInCapacityAvailableForSpecificPurposeOtherThanForTradePurchases
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Aggregate amount of long-term debt as on the date of the most recent balance sheet.

No definition available.

Name:	stwd_LongTermDebtMaturitiesAggregateRepaymentsOfPrincipal
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of long-term debt maturing within the first full fiscal year following the date of the most recent balance sheet presented in the financial statements.

No definition available.

Name:	stwd_LongTermDebtMaturitiesRepaymentsOfPrincipalFirstFullFiscalYear
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of long-term debt maturing within the fourth full fiscal year following the date of the most recent balance sheet presented in the financial statements and thereafter.

No definition available.

Name:	stwd_LongTermDebtMaturitiesRepaymentsOfPrincipalFourthFullFiscalYearAndThereafter
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Data Type:	xbrli:monetaryItemType
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Amount of long-term debt maturing within the remainder of the fiscal year following the date of the most recent balance sheet presented in the financial statements.

No definition available.

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Namespace Prefix:	stwd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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Amount of long-term debt maturing within the second full fiscal year following the date of the most recent balance sheet presented in the financial statements.

No definition available.

Name:	stwd_LongTermDebtMaturitiesRepaymentsOfPrincipalSecondFullFiscalYear
Namespace Prefix:	stwd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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Amount of long-term debt maturing within the third full fiscal year following the date of the most recent balance sheet presented in the financial statements.

No definition available.

Name:	stwd_LongTermDebtMaturitiesRepaymentsOfPrincipalThirdFullFiscalYear
Namespace Prefix:	stwd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the number of real estate properties collateralizing a mortgage loan on real estate originated or acquired during the period.

No definition available.

Name:	stwd_NumberOfRealEstatePropertiesInPortfolioOriginatedOrAcquired
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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

No definition available.

Name:	us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-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 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

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- Details

Name:	us-gaap_DebtInstrumentLineItems
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The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

No definition available.

Name:	us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

No definition available.

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 15

-Subparagraph a

-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 310

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5086-111524

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 45

-Paragraph 1

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- Details

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Total amount of new mortgage loans on real estate during the reporting period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29.6)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674

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The carrying amount as of the date of the latest financial statement presented of mortgage-related securities classified as available for sale or held for investment which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

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

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS140-4/FIN46(R)-8

-Paragraph B6

-Subparagraph b

-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 Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 17

-Subparagraph a(2)

-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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6862952&loc=SL6226653-111729

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 1A

-Subparagraph (b)

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Carrying value as of the balance sheet date , including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878