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Schedule IV - Mortgage Loans on Real Estate (Details2)
 12 Months Ended
Dec. 31, 2014
Contractual Interest Payment Rates [Member] | Senior Mortgages Individually Less than 3 Percent  
Mortgage Loans on Real Estate [Line Items]  
Mortgage Loans on Real Estate, Minimum Interest Rate in Range 4.00%us-gaap_MortgageLoansOnRealEstateMinimumInterestRateInRange
/ star_ContractualInterestRatesAxis
= star_ContractualInterestPaymentRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_SeniorMortgagesIndividuallyLessThan3PercentMember
Mortgage Loans on Real Estate, Maximum Interest Rate in Range 9.68%us-gaap_MortgageLoansOnRealEstateMaximumInterestRateInRange
/ star_ContractualInterestRatesAxis
= star_ContractualInterestPaymentRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_SeniorMortgagesIndividuallyLessThan3PercentMember
Contractual Interest Payment Rates [Member] | Borrower A  
Mortgage Loans on Real Estate [Line Items]  
Loans Receivable, Description of Variable Rate Basis LIBOR
Loans Receivable, Basis Spread on Variable Rate 5.25%us-gaap_LoansReceivableBasisSpreadOnVariableRate
/ star_ContractualInterestRatesAxis
= star_ContractualInterestPaymentRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_BorrowerMember
Contractual Interest Payment Rates [Member] | Borrower C  
Mortgage Loans on Real Estate [Line Items]  
Loans Receivable, Description of Variable Rate Basis LIBOR
Loans Receivable, Basis Spread on Variable Rate 6.00%us-gaap_LoansReceivableBasisSpreadOnVariableRate
/ star_ContractualInterestRatesAxis
= star_ContractualInterestPaymentRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_BorrowerCMember
Contractual Interest Payment Rates [Member] | Borrower D  
Mortgage Loans on Real Estate [Line Items]  
Loans Receivable, Description of Variable Rate Basis LIBOR
Loans Receivable, Basis Spread on Variable Rate 5.25%us-gaap_LoansReceivableBasisSpreadOnVariableRate
/ star_ContractualInterestRatesAxis
= star_ContractualInterestPaymentRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_BorrowerDMember
Contractual Interest Payment Rates [Member] | Borrower E  
Mortgage Loans on Real Estate [Line Items]  
Loans Receivable, Description of Variable Rate Basis LIBOR
Loans Receivable, Basis Spread on Variable Rate 3.00%us-gaap_LoansReceivableBasisSpreadOnVariableRate
/ star_ContractualInterestRatesAxis
= star_ContractualInterestPaymentRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_BorrowerEMember
Contractual Interest Payment Rates [Member] | Borrower B  
Mortgage Loans on Real Estate [Line Items]  
Loans Receivable, Description of Variable Rate Basis LIBOR
Loans Receivable, Basis Spread on Variable Rate 8.00%us-gaap_LoansReceivableBasisSpreadOnVariableRate
/ star_ContractualInterestRatesAxis
= star_ContractualInterestPaymentRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_BorrowerBMember
Contractual Interest Payment Rates [Member] | Borrower F  
Mortgage Loans on Real Estate [Line Items]  
Mortgage Loans on Real Estate, Interest Rate 8.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ star_ContractualInterestRatesAxis
= star_ContractualInterestPaymentRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_BorrowerFMember
Contractual Interest Payment Rates [Member] | Subordinate Mortgages Individually Less than 3 Percent  
Mortgage Loans on Real Estate [Line Items]  
Mortgage Loans on Real Estate, Minimum Interest Rate in Range 8.12%us-gaap_MortgageLoansOnRealEstateMinimumInterestRateInRange
/ star_ContractualInterestRatesAxis
= star_ContractualInterestPaymentRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_SubordinateMortgagesIndividuallyLessThan3PercentMember
Mortgage Loans on Real Estate, Maximum Interest Rate in Range 14.00%us-gaap_MortgageLoansOnRealEstateMaximumInterestRateInRange
/ star_ContractualInterestRatesAxis
= star_ContractualInterestPaymentRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_SubordinateMortgagesIndividuallyLessThan3PercentMember
Contractual Interest Accrual Rates [Member] | Senior Mortgages Individually Less than 3 Percent  
Mortgage Loans on Real Estate [Line Items]  
Mortgage Loans on Real Estate, Minimum Interest Rate in Range 4.00%us-gaap_MortgageLoansOnRealEstateMinimumInterestRateInRange
/ star_ContractualInterestRatesAxis
= star_ContractualInterestAccrualRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_SeniorMortgagesIndividuallyLessThan3PercentMember
Mortgage Loans on Real Estate, Maximum Interest Rate in Range 13.00%us-gaap_MortgageLoansOnRealEstateMaximumInterestRateInRange
/ star_ContractualInterestRatesAxis
= star_ContractualInterestAccrualRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_SeniorMortgagesIndividuallyLessThan3PercentMember
Contractual Interest Accrual Rates [Member] | Borrower A  
Mortgage Loans on Real Estate [Line Items]  
Loans Receivable, Description of Variable Rate Basis LIBOR
Loans Receivable, Basis Spread on Variable Rate 5.25%us-gaap_LoansReceivableBasisSpreadOnVariableRate
/ star_ContractualInterestRatesAxis
= star_ContractualInterestAccrualRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_BorrowerMember
Contractual Interest Accrual Rates [Member] | Borrower C  
Mortgage Loans on Real Estate [Line Items]  
Loans Receivable, Description of Variable Rate Basis LIBOR
Loans Receivable, Basis Spread on Variable Rate 6.00%us-gaap_LoansReceivableBasisSpreadOnVariableRate
/ star_ContractualInterestRatesAxis
= star_ContractualInterestAccrualRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_BorrowerCMember
Contractual Interest Accrual Rates [Member] | Borrower D  
Mortgage Loans on Real Estate [Line Items]  
Loans Receivable, Description of Variable Rate Basis LIBOR
Loans Receivable, Basis Spread on Variable Rate 5.25%us-gaap_LoansReceivableBasisSpreadOnVariableRate
/ star_ContractualInterestRatesAxis
= star_ContractualInterestAccrualRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_BorrowerDMember
Contractual Interest Accrual Rates [Member] | Borrower E  
Mortgage Loans on Real Estate [Line Items]  
Loans Receivable, Description of Variable Rate Basis LIBOR
Loans Receivable, Basis Spread on Variable Rate 3.00%us-gaap_LoansReceivableBasisSpreadOnVariableRate
/ star_ContractualInterestRatesAxis
= star_ContractualInterestAccrualRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_BorrowerEMember
Contractual Interest Accrual Rates [Member] | Borrower B  
Mortgage Loans on Real Estate [Line Items]  
Loans Receivable, Description of Variable Rate Basis LIBOR
Loans Receivable, Basis Spread on Variable Rate 8.00%us-gaap_LoansReceivableBasisSpreadOnVariableRate
/ star_ContractualInterestRatesAxis
= star_ContractualInterestAccrualRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_BorrowerBMember
Contractual Interest Accrual Rates [Member] | Borrower F  
Mortgage Loans on Real Estate [Line Items]  
Mortgage Loans on Real Estate, Interest Rate 8.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ star_ContractualInterestRatesAxis
= star_ContractualInterestAccrualRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_BorrowerFMember
Contractual Interest Accrual Rates [Member] | Subordinate Mortgages Individually Less than 3 Percent  
Mortgage Loans on Real Estate [Line Items]  
Mortgage Loans on Real Estate, Minimum Interest Rate in Range 6.80%us-gaap_MortgageLoansOnRealEstateMinimumInterestRateInRange
/ star_ContractualInterestRatesAxis
= star_ContractualInterestAccrualRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_SubordinateMortgagesIndividuallyLessThan3PercentMember
Mortgage Loans on Real Estate, Maximum Interest Rate in Range 14.00%us-gaap_MortgageLoansOnRealEstateMaximumInterestRateInRange
/ star_ContractualInterestRatesAxis
= star_ContractualInterestAccrualRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_SubordinateMortgagesIndividuallyLessThan3PercentMember
Maximum | Contractual Interest Payment Rates [Member] | Senior Mortgages Individually Less than 3 Percent  
Mortgage Loans on Real Estate [Line Items]  
Loans Receivable, Description of Variable Rate Basis LIBOR
Loans Receivable, Basis Spread on Variable Rate 8.00%us-gaap_LoansReceivableBasisSpreadOnVariableRate
/ star_ContractualInterestRatesAxis
= star_ContractualInterestPaymentRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_SeniorMortgagesIndividuallyLessThan3PercentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Maximum | Contractual Interest Accrual Rates [Member] | Senior Mortgages Individually Less than 3 Percent  
Mortgage Loans on Real Estate [Line Items]  
Loans Receivable, Description of Variable Rate Basis LIBOR
Loans Receivable, Basis Spread on Variable Rate 8.00%us-gaap_LoansReceivableBasisSpreadOnVariableRate
/ star_ContractualInterestRatesAxis
= star_ContractualInterestAccrualRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_SeniorMortgagesIndividuallyLessThan3PercentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Minimum | Borrower E  
Mortgage Loans on Real Estate [Line Items]  
Loans Receivable, Basis Spread on Variable Rate 4.00%us-gaap_LoansReceivableBasisSpreadOnVariableRate
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_BorrowerEMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Minimum | Borrower B  
Mortgage Loans on Real Estate [Line Items]  
Loans Receivable, Basis Spread on Variable Rate 0.25%us-gaap_LoansReceivableBasisSpreadOnVariableRate
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_BorrowerBMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Minimum | Contractual Interest Payment Rates [Member] | Senior Mortgages Individually Less than 3 Percent  
Mortgage Loans on Real Estate [Line Items]  
Loans Receivable, Description of Variable Rate Basis LIBOR
Loans Receivable, Basis Spread on Variable Rate 2.75%us-gaap_LoansReceivableBasisSpreadOnVariableRate
/ star_ContractualInterestRatesAxis
= star_ContractualInterestPaymentRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_SeniorMortgagesIndividuallyLessThan3PercentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Minimum | Contractual Interest Accrual Rates [Member] | Senior Mortgages Individually Less than 3 Percent  
Mortgage Loans on Real Estate [Line Items]  
Loans Receivable, Description of Variable Rate Basis LIBOR
Loans Receivable, Basis Spread on Variable Rate 2.75%us-gaap_LoansReceivableBasisSpreadOnVariableRate
/ star_ContractualInterestRatesAxis
= star_ContractualInterestAccrualRatesMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= star_SeniorMortgagesIndividuallyLessThan3PercentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember