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Derivatives (Interest Rate Hedges) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Interest rate cap
Derivative [Line Items]
Derivative, Notional Amount	$ 500,000,000invest_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	27,324,000invest_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	200,000us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths / us-gaap_DerivativeByNatureAxis = star_TerminatedInterestRateSwapMember
Interest rate swaps
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 700,000us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember

X

- 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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X

- 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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- 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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X

- 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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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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