XML 71 R59.htm IDEA: XBRL DOCUMENT v3.20.4

Real Estate (Acquisitions) (Details) $ in Thousands	1 Months Ended		12 Months Ended
	Jun. 30, 2020	May 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) lease_asset
Real Estate Properties [Line Items]
Acquisitions of real estate assets		$ 56,700	$ 0	$ 240,487	$ 19,454
Net lease assets | lease_asset					2
Safehold Inc.
Real Estate Properties [Line Items]
Ground lease term	99 years			98 years
Net Lease Asset
Real Estate Properties [Line Items]
Acquisitions of real estate assets				$ 11,500	$ 14,800
Net Lease Asset Two
Real Estate Properties [Line Items]
Acquisitions of real estate assets				$ 110,600
Ground lease term				99 years
Lease Hold Interest
Real Estate Properties [Line Items]
Acquisitions of real estate assets				$ 98,200

X

- Definition

Ground Leases, Term

+ References

No definition available.

+ Details

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

X

- Definition

Number of Net Lease Assets

+ References

No definition available.

+ Details

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

X

- Definition

The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

+ 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 (c)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

+ Details

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

X

- Details

Name:	srt_CounterpartyNameAxis=star_SafeholdInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=star_NetLeaseAssetOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=star_NetleaseassettwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=star_LeaseHoldInterestMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: