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The Combination - Fair Value of Tangible Assets Acquired and Identified Intangible Assets and Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 18, 2017
Dec. 31, 2017
Minimum    
Identified intangible assets and liabilities:    
Useful life (in years)   3 years
Maximum    
Identified intangible assets and liabilities:    
Useful life (in years)   40 years
JBG Companies    
Tangible assets:    
Building and improvements $ 543,584  
Tenant improvements 65,572  
Total building and improvements 609,156  
Leasehold improvements 4,422  
Equipment 3,468  
Total leasehold improvements and equipment 7,890  
Identified intangible assets and liabilities:    
Identified intangible assets 138,371  
Below-market real estate leases $ 8,687  
Weighted average amortization period (in years) 10 years 3 months 18 days  
JBG Companies | Equipment    
Identified intangible assets and liabilities:    
Useful life (in years) 5 years  
JBG Companies | In-place leases    
Identified intangible assets and liabilities:    
Identified intangible assets $ 60,317  
Weighted average amortization period (in years) 6 years 5 months  
JBG Companies | Above-market real estate leases    
Identified intangible assets and liabilities:    
Identified intangible assets $ 11,732  
Weighted average amortization period (in years) 6 years 3 months  
JBG Companies | Below-market ground leases    
Identified intangible assets and liabilities:    
Identified intangible assets $ 332  
Weighted average amortization period (in years) 88 years 6 months  
JBG Companies | Option to enter into ground lease    
Identified intangible assets and liabilities:    
Identified intangible assets $ 17,090  
JBG Companies | Management and leasing contracts    
Identified intangible assets and liabilities:    
Identified intangible assets $ 48,900  
Weighted average amortization period (in years) 7 years 6 months  
JBG Companies | Minimum | Building and improvements    
Identified intangible assets and liabilities:    
Useful life (in years) 3 years  
JBG Companies | Minimum | Management and leasing contracts    
Identified intangible assets and liabilities:    
Useful life (in years) 3 years  
JBG Companies | Maximum | Building and improvements    
Identified intangible assets and liabilities:    
Useful life (in years) 40 years  
JBG Companies | Maximum | Management and leasing contracts    
Identified intangible assets and liabilities:    
Useful life (in years) 9 years