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Real Estate (Real Estate Available and Held for Sale) (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 USD ($) property | Jun. 30, 2015 USD ($) property | Dec. 31, 2015 USD ($)
Real Estate Properties [Line Items] |  |  |
Real estate available and held for sale | $ 126,070 |  | $ 137,274
Net Lease |  |  |
Real Estate Properties [Line Items] |  |  |
Real estate available and held for sale | $ 0 |  | 0
Number of Real Estate Properties Transferred to Held for Sale | property | 1 |  |
Commercial Operating Properties |  |  |
Real Estate Properties [Line Items] |  |  |
Property transferred to held for sale, carrying value |  | $ 2,900 |
Number of Properties Transferred from Held for Sale to Held for Use | property |  | 1 |
Residential Operating Properties |  |  |
Real Estate Properties [Line Items] |  |  |
Real estate available and held for sale | $ 110,000 |  | $ 137,300
Executed Contract with Third Party | Net Lease |  |  |
Real Estate Properties [Line Items] |  |  |
Property transferred to held for sale, carrying value | $ 700 | $ 8,200 |
Executed Contract with Third Party | Commercial Operating Properties |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Real Estate Properties Transferred to Held for Sale | property | 1 |  |
Property transferred to held for sale, carrying value | $ 16,100 |  |

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- Definition Number of Properties Transferred from Held for Sale to Held for Use + References No definition available. + Details
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Namespace Prefix: | star_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Real Estate Properties Transferred to Held for Sale + References No definition available. + Details
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Namespace Prefix: | star_
Data Type: | xbrli:integerItemType
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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
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- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, including real estate considered to be inventory of the entity. + References No definition available. + Details
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Namespace Prefix: | star_
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Balance Type: | debit
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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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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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

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