Term of notice required to terminate management agreement with cause.

No definition available.

Name:	safe_ManagementAgreementNoticeToTerminateWithCause
Namespace Prefix:	safe_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Term of notice required to terminate management agreement without cause.

+ References

No definition available.

+ Details

Name:	safe_ManagementAgreementNoticeToTerminateWithoutCause
Namespace Prefix:	safe_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage approval of independent directors to terminate management agreement without cause.

+ References

No definition available.

+ Details

Name:	safe_ManagementAgreementPercentageApprovalOfIndependentDirectorsRequiredToTerminateWithoutCauseTaxableIncomeIncludingCapitalGainsToBeDistributedToQualifyAsReit
Namespace Prefix:	safe_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Term of management agreement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	safe_ManagementAgreementRenewalTerm
Namespace Prefix:	safe_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Term of management agreement in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	safe_ManagementAgreementTermOfContract
Namespace Prefix:	safe_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Fee due in the event the management agreement is terminated by the company without cause prior to the fourth anniversary of the agreement, net of the aggregate amount of management fees paid prior to termination.

+ References

No definition available.

+ Details

Name:	safe_ManagementAgreementTerminationFeeWithoutCause
Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The percentage of gross assets, net of common stock shares owned, used for determining annual fees for managing operations for year five and thereafter per a management agreement.

+ References

No definition available.

+ Details

Name:	safe_ManagementFeePercentYearFiveAndThereafter
Namespace Prefix:	safe_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of fees to be paid for management of operations in year four per a management agreement.

+ References

No definition available.

+ Details

Name:	safe_OperationManagementFeeExpenseYearFour
Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of revenue derived from managing business operations for an entity.

+ References

No definition available.

+ Details

Name:	safe_OperationsManagementFeeRevenue
Namespace Prefix:	safe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate number of shares to be offered under shares sale agreement.

+ References

No definition available.

+ Details

Name:	safe_SharesSaleAgreementAggregateShares
Namespace Prefix:	safe_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of expense for investment management fee, including, but not limited to, expense in connection with research, selection, supervision, and custody of investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 830
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479168/946-830-55-10

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479105/946-220-45-3

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

+ Details

Name:	us-gaap_ManagementFeeExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

+ Details

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

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=safe_SellingStockholderSalesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=safe_StarHoldingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_AffiliatedEntityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=safe_StarHoldingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=safe_SafeholdInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

Related Party Transactions - Star Holdings (Details) - USD ($) $ in Millions				3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 01, 2027	Mar. 28, 2025	Mar. 31, 2023	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Mar. 31, 2027	Mar. 30, 2027	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Apr. 30, 2023
Selling stockholder sales agreement \| Maximum
Related Party Transaction [Line Items]
Aggregate number of shares													1,000,000
Star Holdings \| Affiliated entity
Related Party Transaction [Line Items]
Management fees recorded				$ 1.9	$ 2.7	$ 4.0	$ 6.3
Star Holdings \| Safehold Inc.
Related Party Transaction [Line Items]
Ownership percentage				19.00%		19.00%
Star Holdings \| SpinCo Manager \| Affiliated entity
Related Party Transaction [Line Items]
Annual management fee - Year 4		$ 7.5	$ 5.0					$ 7.5	$ 7.5
Termination fee, termination without cause		$ 55.0	$ 50.0
Management fees										$ 10.0	$ 15.0	$ 25.0
Annual management fee percent of gross book value, year five and thereafter	2.00%
Management agreement initial term			1 year
Management agreement renewal term			1 year
Notice required to terminate management agreement without cause			180 days
Percentage approval of independent directors to terminate management agreement without cause			66.70%
Notice required to terminate management agreement with cause			30 days