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Business and Organization (Details) $ in Billions	9 Months Ended
	Sep. 30, 2016 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Investment across a range of real estate sectors over the past two decades (more than)	$ 35

X

- Definition

Represents the amount invested across a range of real estate sectors by the entity over a period of time.

+ References

No definition available.

+ Details

Name:	star_RealEstateInvestment
Namespace Prefix:	star_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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