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Real Estate (Real Estate Available and Held for Sale) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Real Estate Properties [Line Items]
Real estate available and held for sale	$ 292,608,000star_RealEstateAvailableAndHeldForSale		$ 285,982,000star_RealEstateAvailableAndHeldForSale
Residential Operating Properties
Real Estate Properties [Line Items]
Real estate available and held for sale	132,900,000star_RealEstateAvailableAndHeldForSale / us-gaap_RealEstatePropertiesAxis = star_ResidentialOperatingPropertiesMember		155,800,000star_RealEstateAvailableAndHeldForSale / us-gaap_RealEstatePropertiesAxis = star_ResidentialOperatingPropertiesMember
Condominium Units
Real Estate Properties [Line Items]
Income from sales of real estate	17,600,000star_ResidentialPropertyProfitLoss / us-gaap_RealEstatePropertiesAxis = star_CondominiumUnitsMember	16,500,000star_ResidentialPropertyProfitLoss / us-gaap_RealEstatePropertiesAxis = star_CondominiumUnitsMember
Net Lease
Real Estate Properties [Line Items]
Real estate available and held for sale	11,307,000star_RealEstateAvailableAndHeldForSale / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember		4,521,000star_RealEstateAvailableAndHeldForSale / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember
Operating Properties
Real Estate Properties [Line Items]
Real estate available and held for sale	139,853,000star_RealEstateAvailableAndHeldForSale / us-gaap_RealEstatePropertiesAxis = star_OperatingPropertyMember		162,782,000star_RealEstateAvailableAndHeldForSale / us-gaap_RealEstatePropertiesAxis = star_OperatingPropertyMember
Construction Substantially Complete | Residential Units [Member]
Real Estate Properties [Line Items]
Property Transferred to Held for Sale, Aggregate, Carrying Value	22,900,000star_PropertyTransferredtoHeldforSaleAggregateCarryingValue / star_HeldforSaleReclassificationAxis = star_ConstructionSubstantiallyCompleteMember / us-gaap_RealEstatePropertiesAxis = star_ResidentialUnitsMember
Executed Contract with Third Party | Land
Real Estate Properties [Line Items]
Property Transferred to Held for Sale, Aggregate, Carrying Value	2,800,000star_PropertyTransferredtoHeldforSaleAggregateCarryingValue / star_HeldforSaleReclassificationAxis = star_ExecutedContractwithThirdPartyMember / us-gaap_RealEstatePropertiesAxis = star_LandTwoMember
Executed Contract with Third Party | Net Lease
Real Estate Properties [Line Items]
Property Transferred to Held for Sale, Aggregate, Carrying Value	7,500,000star_PropertyTransferredtoHeldforSaleAggregateCarryingValue / star_HeldforSaleReclassificationAxis = star_ExecutedContractwithThirdPartyMember / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember
Executed Contract with Third Party | Land One [Member]
Real Estate Properties [Line Items]
Property Transferred to Held for Sale, Aggregate, Carrying Value	$ 3,900,000star_PropertyTransferredtoHeldforSaleAggregateCarryingValue / star_HeldforSaleReclassificationAxis = star_ExecutedContractwithThirdPartyMember / us-gaap_RealEstatePropertiesAxis = star_LandOneMember

X

- Definition

Property Transferred to Held for Sale, Aggregate, Carrying Value

+ References

No definition available.

+ Details

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- Definition

Carrying amount as of the balance sheet date of investments in land and buildings held for sale, including real estate considered to be inventory of the entity.

+ References

No definition available.

+ Details

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- Definition

The gain resulting from the sale or other disposition of residential properties or components of those assets during the period.

+ References

No definition available.

+ Details

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