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Real Estate (Real Estate Available and Held for Sale) (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) lease_asset | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Real Estate Properties [Line Items] |  |  |
Property transferred to held for sale, aggregate, carrying value | $ 21,000 | $ 17,900 | $ 11,100
Commercial Operating Properties |  |  |
Real Estate Properties [Line Items] |  |  |
Property transferred from held for sale, aggregate, carrying value |  |  | 2,900,000
Operating Properties |  |  |
Real Estate Properties [Line Items] |  |  |
Property transferred to held for sale, aggregate, carrying value | 20,100 | 16,100 | 2,900
Net Lease |  |  |
Real Estate Properties [Line Items] |  |  |
Property transferred to held for sale, aggregate, carrying value | $ 900 | $ 1,800 | $ 8,200
Condominium Units |  |  |
Real Estate Properties [Line Items] |  |  |
Number of residential units | lease_asset | 2 |  |
Property transferred from held for sale, aggregate, carrying value | $ 1,800,000 |  |

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- Definition Number of Residential Units + References No definition available. + Details
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Namespace Prefix: | star_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

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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 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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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