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Real Estate (Real Estate Available and Held for Sale) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Real Estate Properties [Line Items] |  |
Real estate available and held for sale | $ 137,274 | $ 167,303
Property transferred to held for sale, aggregate, carrying value | 8,200 |
Residential Operating Properties |  |
Real Estate Properties [Line Items] |  |
Real estate available and held for sale | 137,300 | 155,800
Commercial Operating Properties |  |
Real Estate Properties [Line Items] |  |
Property transferred from held for sale, aggregate, carrying value | 2,900 |
Condominium Units |  |
Real Estate Properties [Line Items] |  |
Property transferred to held for sale, aggregate, carrying value |  | 56,700
Net Lease |  |
Real Estate Properties [Line Items] |  |
Real estate available and held for sale | $ 0 | 4,521
Property transferred to held for sale, aggregate, carrying value |  | $ 4,000

X
- Definition Property Transferred from HFS, Aggregate, Carrying Value + References No definition available. + Details
Name: | star_PropertyTransferredfromHFSAggregateCarryingValue
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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

X
- 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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: | us-gaap_RealEstatePropertiesAxis=star_ResidentialOperatingPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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