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v2.4.1.9

Summary of Significant Accounting Policies (Income Taxes) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Total income tax (expense) benefit | $ (3,912,000)us-gaap_IncomeTaxExpenseBenefit |  | $ 659,000us-gaap_IncomeTaxExpenseBenefit |  | $ (8,445,000)us-gaap_IncomeTaxExpenseBenefit
Assets With Foreclosure Elections Carrying Value | 909,300,000star_AssetsWithForeclosureElectionsCarryingValue |  |  |  |
Operating loss carryforwards |  |  | 759,800,000us-gaap_OperatingLossCarryforwards |  |
Taxable REIT Subsidiaries [Member] |  |  |  |  |
Real Estate Asset Basis Differences | 39,300,000star_RealEstateAssetBasisDifferences / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  | 33,000,000star_RealEstateAssetBasisDifferences / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  |
Current tax (expense) benefit | (3,912,000)us-gaap_CurrentIncomeTaxExpenseBenefit / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  | 659,000us-gaap_CurrentIncomeTaxExpenseBenefit / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  | (8,445,000)us-gaap_CurrentIncomeTaxExpenseBenefit / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember
Deferred tax (expense) benefit | 0us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  | 0us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  | 0us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember
Combined Taxable Income of Taxable Reit Subsidiaries | 19,300,000star_CombinedTaxableIncomeOfTaxableReitSubsidiaries / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  | (1,800,000)star_CombinedTaxableIncomeOfTaxableReitSubsidiaries / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  | 42,200,000star_CombinedTaxableIncomeOfTaxableReitSubsidiaries / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember
Operating loss carryforwards | 4,100,000us-gaap_OperatingLossCarryforwards / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  | 14,900,000us-gaap_OperatingLossCarryforwards / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  |
Assets Owned By Taxable Real Estate Investment Trust Subsidiaries | 541,700,000star_AssetsOwnedByTaxableRealEstateInvestmentTrustSubsidiaries / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  |  |  |
Income Taxes Paid | 1,300,000us-gaap_IncomeTaxesPaid / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  | 9,200,000us-gaap_IncomeTaxesPaid / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  | 5,500,000us-gaap_IncomeTaxesPaid / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember
Deferred tax assets | 54,318,000us-gaap_DeferredTaxAssetsGross / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember | [1] | 55,962,000us-gaap_DeferredTaxAssetsGross / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember | [1] |
Valuation allowance | (54,318,000)us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  | (55,962,000)us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  |
Net deferred tax assets (liabilities) | 0us-gaap_DeferredTaxAssetsLiabilitiesNet / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  | 0us-gaap_DeferredTaxAssetsLiabilitiesNet / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  |
Investment Basis Differences | $ 5,900,000star_InvestmentBasisDifferences / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  | $ 8,100,000star_InvestmentBasisDifferences / dei_LegalEntityAxis = star_TaxableReitSubsidiariesMember |  |
[1] | 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 and net operating loss carryforwards of $4.1 million. Deferred tax assets as of December 31, 2013, include timing differences related to real estate basis of $33.0 million, investment basis of $8.1 million, and net operating loss carryforwards of $14.9 million.

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