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Real Estate - Real Estate Available and Held for Sale (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($)
Operating Properties |
Real Estate [Line Items] |
Property transferred to held for sale, aggregate, carrying value | $ 218.1
Net Lease |
Real Estate [Line Items] |
Property transferred to held for sale, aggregate, carrying value | $ 16.2

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- Definition Property Transferred to Held for Sale, Aggregate, Carrying Value + References No definition available. + Details
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RealEstatePropertiesAxis=star_OperatingPropertiesMember
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: |