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

VEREIT Office Assets, Real Estate Investments and Related Intangibles - Impairments (Details)	10 Months Ended	12 Months Ended
	Oct. 31, 2021 USD ($) property	Dec. 31, 2021 USD ($) property	Dec. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($) property
Real Estate Properties [Line Items]
Number of properties \| property		10	1
Provisions for impairment \| $		$ 49,859,000	$ 18,671,000	$ 0
VEREIT Office Assets
Real Estate Properties [Line Items]
Number of properties \| property	4		2	2
Provisions for impairment \| $	$ 28,100,000		$ 9,300,000	$ 3,500,000
VEREIT Office Assets \| Discount Rate \| Assets impaired during the ten months ended October 31, 2021 \| Weighted Average
Real Estate Properties [Line Items]
Alternative investment, measurement input	0.090
VEREIT Office Assets \| Discount Rate \| Assets Impaired During The Twelve Months Ended December 31 2020 \| Weighted Average
Real Estate Properties [Line Items]
Alternative investment, measurement input			0.089
VEREIT Office Assets \| Capitalization Rate \| Assets impaired during the ten months ended October 31, 2021 \| Weighted Average
Real Estate Properties [Line Items]
Alternative investment, measurement input	0.085
VEREIT Office Assets \| Capitalization Rate \| Assets Impaired During The Twelve Months Ended December 31 2020 \| Weighted Average
Real Estate Properties [Line Items]
Alternative investment, measurement input			0.084