XML 99 R65.htm IDEA: XBRL DOCUMENT v3.25.1

Commitments and Contingencies - Schedule of Estimated Total Outstanding Commitments (Details) $ in Thousands	Mar. 31, 2025 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Tenant improvement allowances	$ 49,241
Reimbursable landlord work	11,077
Non-reimbursable landlord work	14,310
Total	74,628
Additional tenant improvement allowances
Lessor, Lease, Description [Line Items]
Additional tenant improvement allowance	$ 3,600

X

- Definition

Lessor, Operating Lease, Commitment Outstanding

+ References

No definition available.

+ Details

Name:	onl_LessorOperatingLeaseCommitmentOutstanding
Namespace Prefix:	onl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Lessor, Operating Lease, Commitment Outstanding, Non-Reimbursable Landlord Work

+ References

No definition available.

+ Details

Name:	onl_LessorOperatingLeaseCommitmentOutstandingNonReimbursableLandlordWork
Namespace Prefix:	onl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Lessor, Operating Lease, Commitment Outstanding, Reimbursable Landlord Work

+ References

No definition available.

+ Details

Name:	onl_LessorOperatingLeaseCommitmentOutstandingReimbursableLandlordWork
Namespace Prefix:	onl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Lessor, Operating Lease, Commitment Outstanding, Tenant Improvement Additional Allowance

+ References

No definition available.

+ Details

Name:	onl_LessorOperatingLeaseCommitmentOutstandingTenantImprovementAdditionalAllowance
Namespace Prefix:	onl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Lessor, Operating Lease, Commitment Outstanding, Tenant Improvement Allowance

+ References

No definition available.

+ Details

Name:	onl_LessorOperatingLeaseCommitmentOutstandingTenantImprovementAllowance
Namespace Prefix:	onl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-3

+ Details

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

X

- Details

Name:	us-gaap_LeaseContractualTermAxis=onl_LeaseContractualTermTenantImprovementsAdditionalElectableTenantAllowancesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: