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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
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