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Commitments and Contingencies (Narrative) (Details) - Jan. 22, 2015 - Land - Real Estate Sales [Member] $ in Millions | USD ($) a
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Other Commitments [Line Items] |
Area of real estate property | 1,250
Unpaid purchase price | $ | $ 114.0
Unpaid purchase price, interest rate | 12.00%
Court Settlement Payment Period | 30 days
Noncontrolling Interest, ownership percentage by noncontrolling owners | 15.00%

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- Definition Court Settlement Payment Period + References No definition available. + Details
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Namespace Prefix: | star_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Unpaid Purchase Price + References No definition available. + Details
Name: | star_UnpaidPurchasePrice
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Unpaid Purchase Price, Interest Rate + References No definition available. + Details
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Namespace Prefix: | star_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Area of a real estate property. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
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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: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TransactionTypeAxis=star_RealEstateSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |