| Orion Office REIT, Leases - Lessor Narrative (Details) | Mar. 31, 2022  property | 
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| Lessor, Lease, Description [Line Items] | |
| Number of properties | 92 | 
| Minimum | |
| Lessor, Lease, Description [Line Items] | |
| Lessor, operating leases, term | 3 months 18 days | 
| Maximum | |
| Lessor, Lease, Description [Line Items] | |
| Lessor, operating leases, term | 16 years | 
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- 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. No definition available. 
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- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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- Definition The number of real estate properties owned as of the balance sheet date. No definition available. 
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- Details 
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- Details 
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