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Loans Receivable and Other Lending Investments, net (Credit Characteristics for Performing Loans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Performing Loans	$ 1,295,703us-gaap_NotesReceivableNet	$ 1,611,927us-gaap_NotesReceivableNet
Senior mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Performing Loans	740,247us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember
Subordinate mortgages
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Performing Loans	53,836us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember
Corporate/Partnership loans
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Performing Loans	501,620us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember
Real Estate Finance
Recorded Investments in loans, presented by class and by credit quality, as indicated by risk rating
Performing Loans	1,166,465us-gaap_NotesReceivableNet / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember	1,091,340us-gaap_NotesReceivableNet / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Weighted Average Risk Ratings	3.23star_WeightedAverageRiskRatings / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember	3.11star_WeightedAverageRiskRatings / 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
Performing Loans	611,009us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember	591,145us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Weighted Average Risk Ratings	2.73star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember	2.50star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FirstMortgageMember / 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
Performing Loans	53,836us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember	61,364us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Weighted Average Risk Ratings	2.87star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember	3.37star_WeightedAverageRiskRatings / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_SecondMortgageMember / 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
Performing Loans	$ 501,620us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember	$ 438,831us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_CorporatePartnershipLoanMember / us-gaap_ExternalCreditRatingByGroupingAxis = us-gaap_PerformingFinancingReceivableMember
Weighted Average Risk Ratings	3.88star_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

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Represents the weighted average risk rating of the instrument.

+ References

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- Definition

Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Article 5

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