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Commitments and Contingencies - Narrative (Details) $ in Millions | Mar. 31, 2025 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
Total leasing commitment | $ 38.8
Tenant improvement allowance | 29.3
Rent concession | $ 9.5

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

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- Definition Lessor, Operating Lease, Restricted Cash, Rent Concession Commitment + References No definition available. + Details
Name: | onl_LessorOperatingLeaseRestrictedCashRentConcessionCommitment
Namespace Prefix: | onl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessor, Operating Lease, Restricted Cash, Tenant Improvement Allowance + References No definition available. + Details
Name: | onl_LessorOperatingLeaseRestrictedCashTenantImprovementAllowance
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_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration