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v2.4.1.9

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 | $ 292,608,000 star_RealEstateAvailableAndHeldForSale |  | $ 285,982,000 star_RealEstateAvailableAndHeldForSale
Residential Operating Properties |  |  |
Real Estate Properties [Line Items] |  |  |
Real estate available and held for sale | 132,900,000 star_RealEstateAvailableAndHeldForSale / us-gaap_RealEstatePropertiesAxis = star_ResidentialOperatingPropertiesMember |  | 155,800,000 star_RealEstateAvailableAndHeldForSale / us-gaap_RealEstatePropertiesAxis = star_ResidentialOperatingPropertiesMember
Condominium Units |  |  |
Real Estate Properties [Line Items] |  |  |
Income from sales of real estate | 17,600,000 star_ResidentialPropertyProfitLoss / us-gaap_RealEstatePropertiesAxis = star_CondominiumUnitsMember | 16,500,000 star_ResidentialPropertyProfitLoss / us-gaap_RealEstatePropertiesAxis = star_CondominiumUnitsMember |
Net Lease |  |  |
Real Estate Properties [Line Items] |  |  |
Real estate available and held for sale | 11,307,000 star_RealEstateAvailableAndHeldForSale / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember |  | 4,521,000 star_RealEstateAvailableAndHeldForSale / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember
Operating Properties |  |  |
Real Estate Properties [Line Items] |  |  |
Real estate available and held for sale | 139,853,000 star_RealEstateAvailableAndHeldForSale / us-gaap_RealEstatePropertiesAxis = star_OperatingPropertyMember |  | 162,782,000 star_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 | 22,900,000 star_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 | 2,800,000 star_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 | 7,500,000 star_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 | $ 3,900,000 star_PropertyTransferredtoHeldforSaleAggregateCarryingValue / star_HeldforSaleReclassificationAxis = star_ExecutedContractwithThirdPartyMember / us-gaap_RealEstatePropertiesAxis = star_LandOneMember |  |

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- Definition Property Transferred to Held for Sale, Aggregate, Carrying Value + References No definition available. + Details
Name: | star_PropertyTransferredtoHeldforSaleAggregateCarryingValue
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
Name: | star_RealEstateAvailableAndHeldForSale
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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
Name: | star_ResidentialPropertyProfitLoss
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Details
Name: | star_HeldforSaleReclassificationAxis=star_ConstructionSubstantiallyCompleteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | star_HeldforSaleReclassificationAxis=star_ExecutedContractwithThirdPartyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RealEstatePropertiesAxis=star_CondominiumUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RealEstatePropertiesAxis=star_NetLeaseAssetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RealEstatePropertiesAxis=star_OperatingPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RealEstatePropertiesAxis=star_ResidentialOperatingPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |