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Real Estate (Tenant Reimbursements) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Operating lease income |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Tenant expense reimbursements | $ 5.7 | $ 6.1 | $ 16.3 | $ 17.0

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- Definition Tenant Expense Reimbursements + References No definition available. + Details
Name: | star_TenantExpenseReimbursements
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
Name: | us-gaap_IncomeStatementLocationAxis=star_OperatingLeaseIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |