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Derivatives (Foreign Exchange Contracts) (Details)	3 Months Ended
	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)	Mar. 31, 2015 Sells euro (EUR)/Buys USD Forward USD ($)	Mar. 31, 2015 Sells euro (EUR)/Buys USD Forward EUR (€)	Mar. 31, 2015 Sells Indian rupee (INR)/Buys USD Forward USD ($)	Mar. 31, 2015 Sells Indian rupee (INR)/Buys USD Forward INR	Mar. 31, 2015 Sells pound sterling (GBP)/Buys USD Forward USD ($)	Mar. 31, 2015 Sells pound sterling (GBP)/Buys USD Forward GBP (£)	Mar. 31, 2015 Sells Canadian dollar (CAD)/Buys USD Forward USD ($)	Mar. 31, 2015 Sells Canadian dollar (CAD)/Buys USD Forward CAD
Derivative [Line Items]
Derivative, Notional Amount			$ 15,482,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = star_SellsEurBuysUsdForwardMember	€ 13,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = star_SellsEurBuysUsdForwardMember	$ 6,534,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = star_SellsINRBuysUSDForwardMember	456,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = star_SellsINRBuysUSDForwardMember	$ 4,548,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = star_SellsGbpBuysUsdForwardMember	£ 3,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = star_SellsGbpBuysUsdForwardMember	$ 8,475,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = star_SellsCadBuysUsdForwardMember	10,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = star_SellsCadBuysUsdForwardMember
Maturity of Foreign Currency Derivatives			Apr. 07, 2015	Apr. 07, 2015	Jun. 30, 2015	Jun. 30, 2015	Apr. 07, 2015	Apr. 07, 2015	Apr. 07, 2015	Apr. 07, 2015
Foreign currency transaction gain (loss)	$ 0us-gaap_ForeignCurrencyTransactionGainLossBeforeTax	$ 300,000us-gaap_ForeignCurrencyTransactionGainLossBeforeTax

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

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- Details

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X

- Definition

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894

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X

- Definition

Date the foreign currency exchange rate derivatives mature or expire, in CCYY-MM-DD format.

+ References

No definition available.

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