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Schedule IV - Mortgage Loans on Real Estate (Details2) | 12 Months Ended
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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

X
- Definition The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin. + References No definition available. + Details
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X
- Definition The reference rate for the variable rate of the loans receivable, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition The highest stated interest rate within the mortgage loans included in the loan grouping. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.3) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 + Details
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- Definition The lowest stated interest rate within the mortgage loans included in the loan grouping. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.3) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 + Details
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