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Commitments and Contingencies - Schedule of Estimated Total Outstanding Commitments (Details) $ in Thousands | Mar. 31, 2026 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
Tenant improvement allowances | $ 38,810
Reimbursable landlord work | 2,234
Non-reimbursable landlord work | 3,842
Total | $ 44,886

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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_
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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
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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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