Orion Office REIT, Fair Value Measures - Narrative (Details)  | 
6 Months Ended | |
|---|---|---|
| 
 Jun. 30, 2022  
USD ($)  
property 
 | 
 Jun. 30, 2021  
USD ($) 
 | 
|
| Fair Value Disclosures [Abstract] | ||
| Number of properties | property | 6 | |
| Provisions for impairment | $ | $ 9,360,000 | $ 0 | 
| X | ||||||||||
- Definition Number Of Impaired Properties No definition available. 
  | 
| X | ||||||||||
- References No definition available. 
  | 
| X | ||||||||||
- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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