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Loans Receivable and Other Lending Investments, net (Credit Characteristics for Performing Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Financing Receivable, Gross	$ 1,461,499us-gaap_NotesReceivableGross	$ 1,295,703us-gaap_NotesReceivableGross
Senior mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Financing Receivable, Gross	880,769us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember
Corporate/Partnership loans
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Financing Receivable, Gross	552,601us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember
Subordinate mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Financing Receivable, Gross	28,129us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember
Real Estate Finance
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Weighted Average Risk Ratings	3.24star_WeightedAverageRiskRatings / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember	3.23star_WeightedAverageRiskRatings / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Financing Receivable, Gross	1,332,558us-gaap_NotesReceivableGross / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember	1,166,465us-gaap_NotesReceivableGross / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Real Estate Finance | Senior mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Weighted Average Risk Ratings	2.80star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember	2.73star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Financing Receivable, Gross	751,828us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember	611,009us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Real Estate Finance | Corporate/Partnership loans
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Weighted Average Risk Ratings	3.83star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember	3.88star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Financing Receivable, Gross	552,601us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember	501,620us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Real Estate Finance | Subordinate mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Weighted Average Risk Ratings	3.61star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember	2.87star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Financing Receivable, Gross	$ 28,129us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember	$ 53,836us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember

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Represents the weighted average risk rating of the instrument.

+ References

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- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(3))

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

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