Orion Office REIT Inc. Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measures - Narrative (Details) $ in Thousands	3 Months Ended
Fair Value Measures - Narrative (Details) $ in Thousands	Mar. 31, 2023 USD ($) property	Mar. 31, 2022 USD ($) property
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of properties \| property	3	2
Impairments	$ 3,754	$ 1,602
Assets Impaired During The Three Months Ended March 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment, long-lived asset, held-for-use	3,800
Impairment of properties held for sale	$ 0
Assets Impaired During The Three Months Ended March 31, 2023 \| Estimated Sales Price
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of properties \| property	3
Assets Impaired During The Three Months Ended March 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment, long-lived asset, held-for-use		1,600
Impairment of properties held for sale		$ 0
Assets Impaired During The Three Months Ended March 31, 2022 \| Estimated Sales Price
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of properties \| property		2