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Commitments and Contingencies (Narrative) (Details) (Subsequent Event, Land, Real Estate Sales [Member], USD $) In Millions, unless otherwise specified | Jan. 22, 2015 acre
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Subsequent Event | Land | Real Estate Sales [Member] |
Other Commitments [Line Items] |
Area of Real Estate Property | 1,250us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_TransactionTypeAxis = star_RealEstateSalesMember
Unpaid Purchase Price | $ 114.0star_UnpaidPurchasePrice / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_TransactionTypeAxis = star_RealEstateSalesMember
Unpaid Purchase Price, Interest Rate | 12.00%star_UnpaidPurchasePriceInterestRate / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_TransactionTypeAxis = star_RealEstateSalesMember
Real Estate Taxes Paid | $ 1.6star_RealEstateTaxesPaid / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_TransactionTypeAxis = star_RealEstateSalesMember
Noncontrolling Interest, ownership percentage by noncontrolling owners | 15.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_TransactionTypeAxis = star_RealEstateSalesMember

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- Definition Real Estate Taxes Paid + References No definition available. + Details
Name: | star_RealEstateTaxesPaid
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unpaid Purchase Price + References No definition available. + Details
Name: | star_UnpaidPurchasePrice
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Unpaid Purchase Price, Interest Rate + References No definition available. + Details
Name: | star_UnpaidPurchasePriceInterestRate
Namespace Prefix: | star_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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