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Real Estate (Real Estate Available and Held for Sale) (Details) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2018 USD ($) lease property | Sep. 30, 2017 USD ($) lease
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of net lease assets | lease | 1 | 1
Operating Properties |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of real estate properties sold | 6 |
Number of Real Estate Properties Transferred to Held for Sale | 2 |
Property transferred to held for sale, aggregate, carrying value | $ | $ 30.2 | $ 0.9
Net Lease |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of real estate properties sold | 3 |

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

X
- Definition Number of Real Estate Properties Sold + References No definition available. + Details
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Balance Type: | na
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X
- Definition Number of Real Estate Properties Transferred to Held for Sale + References No definition available. + Details
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- Definition Property Transferred to Held for Sale, Aggregate, Carrying Value + References No definition available. + Details
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X
- 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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X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |