XML 104 R92.htm IDEA: XBRL DOCUMENT v3.20.4

Risk Management and Derivatives (Risk Concentration) (Details) - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2020 borrower
Concentration Risk [Line Items]
Number of large borrowers or tenants	5
Concentration risk percentage of revenue (no more than)	21.40%
Concentration risk percentage of one single customer, revenue (no more than)	11.60%

X

- Definition

Represents the number of large borrowers considered for evaluating concentration risk.

+ References

No definition available.

+ Details

Name:	star_ConcentrationRiskNumberOfLargeBorrowersOrTenants
Namespace Prefix:	star_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Concentration Risk Percentage of Revenue Accounted by Large Borrowers or Tenants

+ References

No definition available.

+ Details

Name:	star_ConcentrationRiskPercentageofRevenueAccountedbyLargeBorrowersorTenants
Namespace Prefix:	star_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Concentration Risk, Percentage of Revenue Accounted by One Single Borrower or Tenant

+ References

No definition available.

+ Details

Name:	star_ConcentrationRiskPercentageofRevenueAccountedbyOneSingleBorrowerorTenant
Namespace Prefix:	star_
Data Type:	num:percentItemType
Balance Type:	na
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_ConcentrationRiskLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: