XML 95 R81.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Other Investments Other Investments (Amended Management Agreement) (Details) |  | 12 Months Ended
--- | --- | ---
Jan. 02, 2019 USD ($) multiple | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |
Additional cash investment in equity method investment |  | $ 94,578,000 | $ 224,219,000 | $ 58,197,000
Subsequent Event |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Management agreement, share lock up period, subject to certain restrictions | 2 years |  |  |
Management agreement, termination fee as multiple of prior year management fee | multiple | 3 |  |  |
Management agreement, equity raised since inception metric related to renewal and termination | $ 820,000,000 |  |  |
Real Estate Investment | Safety, Income and Growth, Inc. | Subsequent Event |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Additional cash investment in equity method investment | $ 250,000,000 |  |  |
Fee percent of SAFE Equity up to $1.5 billion | Subsequent Event |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Management fee as percent of equity | 1.00% |  |  |
Fee percent of SAFE Equity up to $1.5 billion | Maximum | Subsequent Event |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Management fee equity threshold amount | $ 1,500,000,000.0 |  |  |
Fee percent of SAFE Equity between $1.5 billion and $3.0 billion | Subsequent Event |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Management fee as percent of equity | 1.25% |  |  |
Fee percent of SAFE Equity between $1.5 billion and $3.0 billion | Minimum | Subsequent Event |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Management fee equity threshold amount | $ 1,500,000,000.0 |  |  |
Fee percent of SAFE Equity between $1.5 billion and $3.0 billion | Maximum | Subsequent Event |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Management fee equity threshold amount | $ 3,000,000,000.0 |  |  |
Fee percent of SAFE Equity between $3.0 billion and $5.0 billion | Subsequent Event |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Management fee as percent of equity | 1.375% |  |  |
Fee percent of SAFE Equity between $3.0 billion and $5.0 billion | Minimum | Subsequent Event |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Management fee equity threshold amount | $ 3,000,000,000.0 |  |  |
Fee percent of SAFE Equity between $3.0 billion and $5.0 billion | Maximum | Subsequent Event |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Management fee equity threshold amount | $ 5,000,000,000.0 |  |  |
Fee percent of SAFE Equity over $5.0 billion | Subsequent Event |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Management fee as percent of equity | 1.50% |  |  |
Fee percent of SAFE Equity over $5.0 billion | Minimum | Subsequent Event |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Management fee equity threshold amount | $ 5,000,000,000.0 |  |  |

X
- Definition Related Party Transaction, Management Agreement, Renewal Clause, Equity Raised Since Inception + References No definition available. + Details
Name: | star_RelatedPartyTransactionManagementAgreementRenewalClauseEquityRaisedSinceInception
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Related Party Transaction, Management Agreement, Renewal Clause, Termination Fee As Multiple Of Prior Year Management Fee + References No definition available. + Details
Name: | star_RelatedPartyTransactionManagementAgreementRenewalClauseTerminationFeeAsMultipleOfPriorYearManagementFee
Namespace Prefix: | star_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Related Party Transaction, Management Agreement, Share Lock Up Period + References No definition available. + Details
Name: | star_RelatedPartyTransactionManagementAgreementShareLockUpPeriod
Namespace Prefix: | star_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Related Party Transaction, Management Fee, Percent of Equity + References No definition available. + Details
Name: | star_RelatedPartyTransactionManagementFeePercentofEquity
Namespace Prefix: | star_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Related Party Transaction, Management Fee, Shareholders' Equity Threshold Amount + References No definition available. + Details
Name: | star_RelatedPartyTransactionManagementFeeShareholdersEquityThresholdAmount
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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
Name: | us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_RealEstateInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=star_SafetyIncomeandGrowthInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | star_ManagementAgreementFeeStructureAxis=star_ManagementFeeTrancheOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | star_ManagementAgreementFeeStructureAxis=star_ManagementFeeTrancheTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | star_ManagementAgreementFeeStructureAxis=star_ManagementFeeTrancheThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | star_ManagementAgreementFeeStructureAxis=star_ManagementFeeTrancheFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |