Summary of Significant Accounting Policies, Distributions (Details)	3 Months Ended
Mar. 31, 2026
Distributions [Abstract]
Notice period to opt dividend reinvestment plan	20 days

The notice period to opt dividend reinvestment plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

Name:	star_NoticePeriodToOptDividendReinvestmentPlan
Namespace Prefix:	star_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration