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Debt Obligations, net (Debt Covenants) (Details) | 9 Months Ended
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Sep. 30, 2017
Unsecured Credit Facilities |
Debt Instrument [Line Items] |
Minimum ratio of unencumbered assets to unsecured indebtedness (at least) | 1.2
Debt instrument covenant multiple of minimum fixed charges on outstanding borrowings | 1.5
2016 Senior Secured Credit Facility |
Debt Instrument [Line Items] |
Multiple of the minimum collateral coverage on outstanding borrowings (at least) | 1.25
2015 $325 Million Secured Revolving Credit Facility |
Debt Instrument [Line Items] |
Debt instrument covenant multiple of minimum fixed charges on outstanding borrowings | 1.5
Multiple of the minimum collateral coverage on outstanding borrowings (at least) | 1.5
Total secured credit facilities and mortgages |
Debt Instrument [Line Items] |
Percentage of REIT taxable income permitted for distribution under debt covenants | 100.00%

X
- Definition Represents the multiple of the minimum collateral coverage on outstanding borrowings required under the terms of the debt covenant. + References No definition available. + Details
Name: | star_DebtInstrumentCovenantMultipleofMinimumCollateralCoverageonOutstandingBorrowings
Namespace Prefix: | star_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument, Covenant, Multiple of Minimum Fixed Charges on Outstanding Borrowings + References No definition available. + Details
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Namespace Prefix: | star_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the percentage of taxable income that is permitted for distribution, under the terms of the debt covenant, if the entity maintains its REIT qualification. + References No definition available. + Details
Name: | star_DebtInstrumentCovenantPercentageOfTaxableIncomePermittedForDistributionIfReitClassificationIsMaintained
Namespace Prefix: | star_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the minimum ratio of encumbered assets to unsecured indebtedness required under the terms of the debt covenant. + References No definition available. + Details
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Namespace Prefix: | star_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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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Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=star_A2016SeniorSecuredCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=star_SecuredCreditFacilityRevolverDueMarch2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=star_SecuredCreditFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |