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Real Estate (Real Estate Available and Held for Sale) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Real Estate Properties [Line Items]
Impairment of assets	$ 34,634,000us-gaap_AssetImpairmentCharges	$ 12,589,000us-gaap_AssetImpairmentCharges	$ 13,778,000us-gaap_AssetImpairmentCharges
Impairment of Real Estate	34,600,000us-gaap_ImpairmentOfRealEstate	14,400,000us-gaap_ImpairmentOfRealEstate	35,400,000us-gaap_ImpairmentOfRealEstate
Real estate available and held for sale	285,982,000star_RealEstateAvailableAndHeldForSale	360,517,000star_RealEstateAvailableAndHeldForSale
Residential Operating Properties
Real Estate Properties [Line Items]
Real estate available and held for sale	155,800,000star_RealEstateAvailableAndHeldForSale / us-gaap_RealEstatePropertiesAxis = star_ResidentialOperatingPropertiesMember	221,000,000star_RealEstateAvailableAndHeldForSale / us-gaap_RealEstatePropertiesAxis = star_ResidentialOperatingPropertiesMember
Land
Real Estate Properties [Line Items]
Real estate available and held for sale	118,679,000star_RealEstateAvailableAndHeldForSale / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember	132,189,000star_RealEstateAvailableAndHeldForSale / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember
Property transferred from HFS, aggregate, carrying value	6,500,000star_PropertyTransferredfromHFSAggregateCarryingValue / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember	49,700,000star_PropertyTransferredfromHFSAggregateCarryingValue / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember
Property transferred to held for sale, aggregate, carrying value		31,800,000star_PropertyTransferredtoHeldforSaleAggregateCarryingValue / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember
Number of properties transferred from held for sale to held for use		2star_NumberOfPropertiesTransferredFromHeldForSaleToHeldForUse / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember
Number of real estate properties transferred to held for sale		3star_NumberofRealEstatePropertiesTransferredtoHeldforSale / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember
Number of real estate properties sold		3star_NumberofRealEstatePropertiesSold / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember
Income from sales of real estate		600,000star_ResidentialPropertyProfitLoss / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember
Condominium Units
Real Estate Properties [Line Items]
Property transferred to held for sale, aggregate, carrying value	56,700,000star_PropertyTransferredtoHeldforSaleAggregateCarryingValue / us-gaap_RealEstatePropertiesAxis = star_CondominiumUnitsMember
Income from sales of real estate	79,100,000star_ResidentialPropertyProfitLoss / us-gaap_RealEstatePropertiesAxis = star_CondominiumUnitsMember	82,600,000star_ResidentialPropertyProfitLoss / us-gaap_RealEstatePropertiesAxis = star_CondominiumUnitsMember	63,500,000star_ResidentialPropertyProfitLoss / us-gaap_RealEstatePropertiesAxis = star_CondominiumUnitsMember
Net Lease
Real Estate Properties [Line Items]
Real estate available and held for sale	4,521,000star_RealEstateAvailableAndHeldForSale / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember	0star_RealEstateAvailableAndHeldForSale / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember
Property transferred to held for sale, aggregate, carrying value	4,000,000star_PropertyTransferredtoHeldforSaleAggregateCarryingValue / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember	9,800,000star_PropertyTransferredtoHeldforSaleAggregateCarryingValue / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember
Gain (Loss) on disposition of real estate, discontinued operations		$ 3,600,000us-gaap_GainLossOnDispositionOfRealEstateDiscontinuedOperations / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember
Number of real estate properties sold		5star_NumberofRealEstatePropertiesSold / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember

X

- Definition

Number of Properties Transferred from Held for Sale to Held for Use

+ References

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- Definition

Number of Real Estate Properties Sold

+ References

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Number of Real Estate Properties Transferred to Held for Sale

+ References

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- Definition

Property Transferred from HFS, Aggregate, Carrying Value

+ References

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- Definition

Property Transferred to Held for Sale, Aggregate, Carrying Value

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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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X

- 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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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228

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- Definition

Amount of difference between the carrying amount and the sales price of real estate properties sold as part of discontinued operations.

+ References

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- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230

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