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Commitments and Contingencies - Schedule of Estimated Total Outstanding Commitments (Details) $ in Thousands | Jun. 30, 2026 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
Tenant improvement allowances | $ 36,510
Reimbursable landlord work | 2,315
Non-reimbursable landlord work | 4,619
Total | $ 43,444

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- Definition Lessor, Operating Lease, Commitment Outstanding + References No definition available. + Details
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Namespace Prefix: | onl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessor, Operating Lease, Commitment Outstanding, Non-Reimbursable Landlord Work + References No definition available. + Details
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Namespace Prefix: | onl_
Data Type: | xbrli:monetaryItemType
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- Definition Lessor, Operating Lease, Commitment Outstanding, Reimbursable Landlord Work + References No definition available. + Details
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Namespace Prefix: | onl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
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