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Real Estate (Real Estate Available and Held for Sale) (Details) (USD $) | 12 Months Ended
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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 No definition available. + Details
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- Definition Number of Real Estate Properties Sold + References No definition available. + Details
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- Definition Number of Real Estate Properties Transferred to Held for Sale + References No definition available. + Details
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- Definition Property Transferred from HFS, Aggregate, Carrying Value + References No definition available. + Details
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- 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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Namespace Prefix: | star_
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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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Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
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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 + Details
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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 No definition available. + Details
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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 + Details
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- Details
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- Details
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- Details
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- Details
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