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Commitments and Contingencies - Narrative (Details) $ in Millions	Mar. 31, 2025 USD ($)
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

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X

- Definition

Lessor, Operating Lease, Restricted Cash, Rent Concession Commitment

+ References

No definition available.

+ Details

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X

- Definition

Lessor, Operating Lease, Restricted Cash, Tenant Improvement Allowance

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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