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Other Assets and Other Liabilities (Deferred Tax Assets and Liabilities) (Details) (USD $) | Dec. 31, 2013 | Mar. 31, 2015 | Dec. 31, 2014
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Schedule of deferred tax assets and liabilities [Line Items] |  |  |  |  |
Operating loss carryforwards | $ 759,800,000 us-gaap_OperatingLossCarryforwards |  |  |  |
Taxable REIT Subsidiaries [Member] |  |  |  |  |
Schedule of deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax assets |  | 57,053,000 us-gaap_DeferredTaxAssetsGross / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember | [1] | 54,318,000 us-gaap_DeferredTaxAssetsGross / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember | [1]
Valuation allowance |  | (57,053,000)us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  | (54,318,000)us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |
Net deferred tax assets (liabilities) |  | 0 us-gaap_DeferredTaxAssetsLiabilitiesNet / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  | 0 us-gaap_DeferredTaxAssetsLiabilitiesNet / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |
Real estate basis differences |  | 39,100,000 us-gaap_DeferredTaxAssetsInvestmentInSubsidiaries / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  | 39,300,000 us-gaap_DeferredTaxAssetsInvestmentInSubsidiaries / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |
Investments basis differences |  | 6,200,000 us-gaap_DeferredTaxAssetsInvestments / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  | 5,900,000 us-gaap_DeferredTaxAssetsInvestments / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |
Deferred expenses differences |  | 5,600,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  | 2,700,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |
Operating loss carryforwards |  | $ 3,900,000 us-gaap_OperatingLossCarryforwards / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  | $ 4,100,000 us-gaap_OperatingLossCarryforwards / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |
[1] | Deferred tax assets as of March 31, 2015 include timing differences related primarily to real estate basis of $39.1 million, investment basis of $6.2 million, deferred expenses of $5.6 million, and net operating loss carryforwards of $3.9 million. Deferred tax assets as of December 31, 2014, include timing differences related primarily to real estate basis of $39.3 million, investment basis of $5.9 million, net operating loss carryforwards of $4.1 million, and deferred expenses of $2.7 million.

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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