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Transactions with Vornado and Related Parties (Details)
ft² in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 18, 2017
USD ($)
Jul. 17, 2017
USD ($)
Aug. 12, 2014
USD ($)
Jun. 30, 2016
USD ($)
ft²
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Aug. 31, 2014
USD ($)
ft²
Related Party Transaction [Line Items]                  
Proceeds from repayment of receivable from former parent           $ 75,000,000 $ 4,000,000 $ 7,000,000  
Receivable from former parent         $ 0 0 75,062,000    
Proceeds from credit facility           115,751,000 0 0  
Corporate and other           47,131,000 48,753,000 44,424,000  
Universal Buildings, Washington DC                  
Related Party Transaction [Line Items]                  
Area of real estate property (in square feet) | ft²                 687
Bowen Building, Washington DC                  
Related Party Transaction [Line Items]                  
Area of real estate property (in square feet) | ft²       231          
Financing of the Universal Buildings                  
Related Party Transaction [Line Items]                  
Debt instrument, face amount                 $ 185,000,000.0
Affiliate | Vornado | Vornado's revolving credit facility                  
Related Party Transaction [Line Items]                  
Interest expense to Vornado         $ 1,100,000 1,300,000      
Proceeds from credit facility       $ 115,600,000          
Affiliate | Vornado | Mortgage loan secured by Bowen Building                  
Related Party Transaction [Line Items]                  
Repayment of mortgage loan       115,000,000          
Accrued interest on mortgage loan       $ 608,000          
Affiliate | Legacy JBG Funds                  
Related Party Transaction [Line Items]                  
Corporate and other           2,300,000      
Affiliate | Allocations of centralized corporate costs | Vornado                  
Related Party Transaction [Line Items]                  
Allocated amounts included in general and administrative expense           13,000,000 20,700,000 20,000,000  
Affiliate | Financing transactions | Vornado | Financing of the Universal Buildings                  
Related Party Transaction [Line Items]                  
Loan to Vornado     $ 86,000,000            
Proceeds from repayment of receivable from former parent             4,000,000 7,000,000  
Interest Income on loan receivable from Vornado           $ 1,800,000 3,300,000 3,000,000  
Affiliate | Financing transactions | Vornado | Financing of the Universal Buildings | LIBOR                  
Related Party Transaction [Line Items]                  
Mortgage loan interest rate           2.90%      
Affiliate | Financing transactions | Vornado | Note agreement for development of Bartlett                  
Related Party Transaction [Line Items]                  
Debt instrument, face amount $ 170,000,000                
Amount outstanding on note agreements with Vornado             166,500,000    
Interest expense to Vornado           $ 4,100,000 4,100,000 846,000  
Affiliate | Supervise cleaning, engineering and security services | BMS                  
Related Party Transaction [Line Items]                  
Related party transaction amount           13,600,000 $ 12,100,000 $ 12,400,000  
Affiliate | Separation and Combination transaction | Vornado                  
Related Party Transaction [Line Items]                  
Transaction services, initial period (in months) 2 years                
Expenses from related parties           2,200,000      
Revenue from related parties           779,000      
Affiliate | Fees from Legacy JBG Funds | Legacy JBG Funds                  
Related Party Transaction [Line Items]                  
Real estate service revenue           19,900,000      
Trustee | Consulting agreement                  
Related Party Transaction [Line Items]                  
Transaction services, initial period (in months)   24 months              
Expenses from related parties           16,400,000      
Related party transaction, monthly amount   $ 169,400              
JBG Companies                  
Related Party Transaction [Line Items]                  
Liability incurred in connection with the Combination $ 4,100,000         $ 3,000,000