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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
Schedule of deferred tax assets and liabilities [Line Items]      
Operating loss carryforwards $ 759,800,000us-gaap_OperatingLossCarryforwards    
Taxable REIT Subsidiaries [Member]      
Schedule of deferred tax assets and liabilities [Line Items]      
Deferred tax assets   57,053,000us-gaap_DeferredTaxAssetsGross
/ dei_LegalEntityAxis
= star_TaxableReitSubsidiariesMember		 [1] 54,318,000us-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)   0us-gaap_DeferredTaxAssetsLiabilitiesNet
/ dei_LegalEntityAxis
= star_TaxableReitSubsidiariesMember		 0us-gaap_DeferredTaxAssetsLiabilitiesNet
/ dei_LegalEntityAxis
= star_TaxableReitSubsidiariesMember
Real estate basis differences   39,100,000us-gaap_DeferredTaxAssetsInvestmentInSubsidiaries
/ dei_LegalEntityAxis
= star_TaxableReitSubsidiariesMember		 39,300,000us-gaap_DeferredTaxAssetsInvestmentInSubsidiaries
/ dei_LegalEntityAxis
= star_TaxableReitSubsidiariesMember
Investments basis differences   6,200,000us-gaap_DeferredTaxAssetsInvestments
/ dei_LegalEntityAxis
= star_TaxableReitSubsidiariesMember		 5,900,000us-gaap_DeferredTaxAssetsInvestments
/ dei_LegalEntityAxis
= star_TaxableReitSubsidiariesMember
Deferred expenses differences   5,600,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther
/ dei_LegalEntityAxis
= star_TaxableReitSubsidiariesMember		 2,700,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther
/ dei_LegalEntityAxis
= star_TaxableReitSubsidiariesMember
Operating loss carryforwards   $ 3,900,000us-gaap_OperatingLossCarryforwards
/ dei_LegalEntityAxis
= star_TaxableReitSubsidiariesMember		 $ 4,100,000us-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.