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Risk Management and Derivatives (Risk Concentration) (Details) - Customer Concentration Risk | 12 Months Ended
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Dec. 31, 2020 borrower
Concentration Risk [Line Items] |
Number of large borrowers or tenants | 5
Concentration risk percentage of revenue (no more than) | 21.40%
Concentration risk percentage of one single customer, revenue (no more than) | 11.60%

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- Definition Represents the number of large borrowers considered for evaluating concentration risk. + References No definition available. + Details
Name: | star_ConcentrationRiskNumberOfLargeBorrowersOrTenants
Namespace Prefix: | star_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Concentration Risk Percentage of Revenue Accounted by Large Borrowers or Tenants + References No definition available. + Details
Name: | star_ConcentrationRiskPercentageofRevenueAccountedbyLargeBorrowersorTenants
Namespace Prefix: | star_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Concentration Risk, Percentage of Revenue Accounted by One Single Borrower or Tenant + References No definition available. + Details
Name: | star_ConcentrationRiskPercentageofRevenueAccountedbyOneSingleBorrowerorTenant
Namespace Prefix: | star_
Data Type: | num:percentItemType
Balance Type: | na
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_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |