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Real Estate (Allowance for doubtful accounts) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Real Estate Tenant Receivables [Member]
Schedule of Operating Lease Allowance for Doubtful Accounts [Line Items]
Allowance for Doubtful Accounts Receivable	$ 1.4us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_RealEstateTenantReceivablesMember	$ 1.3us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_RealEstateTenantReceivablesMember
Deferred Operating Lease [Member]
Schedule of Operating Lease Allowance for Doubtful Accounts [Line Items]
Allowance for Doubtful Accounts Receivable	$ 2.4us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_DeferredOperatingLeaseMember	$ 2.4us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = star_DeferredOperatingLeaseMember

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- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.4)

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

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