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Summary of Significant Accounting Policies (Income Taxes) (Details) (USD $)	12 Months Ended
	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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