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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: