Annual report pursuant to Section 13 and 15(d)

Orion Office REIT, Summary of Significant Accounting Policies (Details)

v3.22.1
Orion Office REIT, Summary of Significant Accounting Policies (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Entity Information [Line Items]      
Lease termination income $ 300,000 $ 0 $ 0
Property management fee revenue 300,000 0 0
Impairment of unconsolidated joint venture 0    
Impairment of property and equipment 0 0 0
Restricted cash 0 3,900,000 3,700,000
Franchise and state and local tax expense $ 200,000    
Impounds related to mortgages payable      
Entity Information [Line Items]      
Restricted cash   3,400,000 3,200,000
Security deposits related to mortgages payable      
Entity Information [Line Items]      
Restricted cash   $ 500,000 $ 500,000
Minimum      
Entity Information [Line Items]      
Expected lease-up period 6 months    
Impairment considerations, disposal period (more likely than not) 12 months    
Maximum      
Entity Information [Line Items]      
Expected lease-up period 18 months    
Impairment considerations, disposal period (more likely than not) 24 months    
Building      
Entity Information [Line Items]      
Real estate assets, useful life 35 years    
Building Fixtures and Improvements | Minimum      
Entity Information [Line Items]      
Real estate assets, useful life 5 years    
Building Fixtures and Improvements | Maximum      
Entity Information [Line Items]      
Real estate assets, useful life 15 years    
Computer Equipment | Minimum      
Entity Information [Line Items]      
Real estate assets, useful life 3 years    
Computer Equipment | Maximum      
Entity Information [Line Items]      
Real estate assets, useful life 7 years