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Risk Management and Derivatives (Risk Concentration) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
CALIFORNIA
Concentration Risk [Line Items]
Concentration risk, percentage	14.60%us-gaap_ConcentrationRiskPercentage1 / invest_InvestmentGeographicRegionAxis = stpr_CA
NEW YORK
Concentration Risk [Line Items]
Concentration risk, percentage	13.90%us-gaap_ConcentrationRiskPercentage1 / invest_InvestmentGeographicRegionAxis = stpr_NY
Land
Concentration Risk [Line Items]
Concentration risk, percentage	21.70%us-gaap_ConcentrationRiskPercentage1 / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember
Commercial Entertainment and Leisure Real Estate
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_RealEstatePropertiesAxis = star_CommercialEntertainmentAndLeisureRealEstateMember
Commercial Office Real Estate
Concentration Risk [Line Items]
Concentration risk, percentage	26.70%us-gaap_ConcentrationRiskPercentage1 / us-gaap_RealEstatePropertiesAxis = star_CommercialOfficeRealEstateMember
Mixed Use Collateral
Concentration Risk [Line Items]
Concentration risk, percentage	13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_RealEstatePropertiesAxis = star_MixedUseCollateralMember
Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk Number of Large Borrowers or Tenants	5star_ConcentrationRiskNumberOfLargeBorrowersOrTenants / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Revenue Accounted by Large Borrowers or Tenants	115star_RevenueAccountedbyLargeBorrowersorTenants / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Concentration risk percentage of revenue	6.00%star_ConcentrationRiskPercentageofRevenueAccountedbyLargeBorrowersorTenants / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember

X

- Definition

Represents the number of large borrowers considered for evaluating concentration risk.

+ References

No definition available.

+ Details

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- Definition

Concentration Risk Percentage of Revenue Accounted by Large Borrowers or Tenants

+ References

No definition available.

+ Details

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- Definition

Revenue Accounted by Large Borrowers or Tenants

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Details

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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X

- Details

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X

- Details

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