Orion Office REIT Inc. Annual report pursuant to Section 13 and 15(d)

Orion Office REIT, Fair Value Measures - Narrative (Details)

Orion Office REIT, Fair Value Measures - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) property	Dec. 31, 2022 USD ($) property	Dec. 31, 2021 USD ($) property	Nov. 13, 2023 USD ($)	Dec. 01, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of properties \| property	8	18	10
Impairments	$ 33,112	$ 66,359	$ 49,859
Impairment Long Lived Asset Held For Use Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag			Impairments
Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount	60,000	175,000
Interest rate collar \| Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount	60,000			$ 60,000
Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount		175,000			$ 175,000
Interest rate swaps \| Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount		175,000
Assets Impaired During The Twelve Months Ended December 31 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment, long-lived asset, held-for-use	5,900
Impairment of properties disposed of	$ 27,200
Assets Impaired During The Twelve Months Ended December 31 2023 \| Estimated Sales Price
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of properties \| property	7
Assets Impaired During The Twelve Months Ended December 31 2023 \| Discount Rate and Capitalization Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of properties \| property	1
Assets Impaired During The Twelve Months Ended December 31 2023 \| Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input (percent)	0.090
Assets Impaired During The Twelve Months Ended December 31 2023 \| Capitalization Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input (percent)	0.085
Assets Impaired During The Twelve Months Ended December 31 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment, long-lived asset, held-for-use		39,500
Impairment of properties held for sale		200
Impairment of properties disposed of		$ 26,700
Assets Impaired During The Twelve Months Ended December 31 2022 \| Estimated Sales Price
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of properties \| property		17
Assets Impaired During The Twelve Months Ended December 31 2022 \| Discount Rate and Capitalization Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of properties \| property		1
Assets Impaired During The Twelve Months Ended December 31 2022 \| Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input (percent)		0.085
Assets Impaired During The Twelve Months Ended December 31 2022 \| Capitalization Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input (percent)		0.080
Assets Impaired During The Twelve Months Ended December 31 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment, long-lived asset, held-for-use			$ 49,900
Impairment of properties held for sale			$ 0