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Risk Management and Derivatives (Risk Concentration) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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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

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- 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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- 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 + Details
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- Details
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