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v2.4.1.9

Risk Management and Derivatives (Notional Amounts) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Oct. 31, 2012
Sells INR/Buys USD Forward |  |
Derivative [Line Items] |  |
Maturity | Jun. 30, 2015 |
Sells euro (EUR)/Buys USD Forward |  |
Derivative [Line Items] |  |
Maturity | Jan. 07, 2015 |
Sells pound sterling (GBP)/Buys USD Forward |  |
Derivative [Line Items] |  |
Maturity | Jan. 07, 2015 |
Sells Canadian dollar (CAD)/Buys USD Forward |  |
Derivative [Line Items] |  |
Maturity | Jan. 07, 2015 |
Interest rate cap |  |
Derivative [Line Items] |  |
Fixed Rate | 1.00%us-gaap_DerivativeCapInterestRate / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateCapMember |
Interest rate swap |  |
Derivative [Line Items] |  |
Notional Amount |  | $ 28.0us-gaap_DerivativeAmountOfHedgedItem / us-gaap_DerivativeByNatureAxis = star_InterestRateSwapOneMember
Fixed Rate | 3.47%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeByNatureAxis = star_InterestRateSwapOneMember |

X
- Definition Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeAmountOfHedgedItem
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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
Name: | us-gaap_DerivativeCapInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the foreign currency exchange rate derivatives mature or expire, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_MaturityOfForeignCurrencyDerivatives1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeByNatureAxis=star_InterestRateSwapOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeByNatureAxis=us-gaap_InterestRateCapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |