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Real Estate (Real Estate Available and Held for Sale) (Details) (USD $) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Real Estate Properties [Line Items] |  |
Real estate available and held for sale | $ 317,964,000 | $ 360,517,000
Residential Operating Properties |  |
Real Estate Properties [Line Items] |  |
Real estate available and held for sale | 189,600,000 | 221,000,000
Land |  |
Real Estate Properties [Line Items] |  |
Real estate available and held for sale | 121,367,000 | 132,189,000
Property transferred from HFS, aggregate, carrying value | 6,500,000 |
Condominium Units |  |
Real Estate Properties [Line Items] |  |
Property transferred to held for sale, aggregate, carrying value | $ 56,700,000 |

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

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