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Derivatives (Interest Rate Hedges) (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015
Interest rate cap |
Derivative [Line Items] |
Derivative, Notional Amount | $ 500,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateCapMember
Derivative, Cap Interest Rate | 1.00%us-gaap_DerivativeCapInterestRate / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateCapMember
Interest rate swap |
Derivative [Line Items] |
Derivative, Variable Interest Rate | 2.00%us-gaap_DerivativeBasisSpreadOnVariableRate / us-gaap_DerivativeByNatureAxis = star_InterestRateSwapOneMember
Derivative, Notional Amount | 27,324,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = star_InterestRateSwapOneMember
Derivative, Fixed Interest Rate | 3.47%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeByNatureAxis = star_InterestRateSwapOneMember
Terminated Interest Rate Swap |
Derivative [Line Items] |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | 200,000 us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths / us-gaap_DerivativeByNatureAxis = star_TerminatedInterestRateSwapMember
Interest rate swaps |
Derivative [Line Items] |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | $ 700,000 us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Period Type: | instant

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The percentage points added to the reference rate to compute the variable rate on the interest rate derivative. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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- Details
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- Details
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- Details
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- Details
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