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Real Estate (Tenant Reimbursements) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating lease income
Real Estate Properties [Line Items]
Tenant expense reimbursements	$ 5.7	$ 6.1	$ 16.3	$ 17.0

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- Definition

Tenant Expense Reimbursements

+ References

No definition available.

+ Details

Name:	star_TenantExpenseReimbursements
Namespace Prefix:	star_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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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

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

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- Details

Name:	us-gaap_IncomeStatementLocationAxis=star_OperatingLeaseIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: