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Subsequent Events - Equity Awards Narrative (Details) - Subsequent Event
Aug. 01, 2017
installment
shares
Jul. 18, 2017
USD ($)
person
$ / shares
shares
Jul. 17, 2017
shares
Trustee | Long-term incentive partnership units      
Subsequent Event [Line Items]      
Deferred compensation arrangement, number of individuals awarded | person   7  
Deferred compensation arrangement, value | $   $ 250,000  
JBG Companies      
Subsequent Event [Line Items]      
Price per share of stock issued for acquisition (in dollars per share) | $ / shares   $ 37.10  
Initial Formation Awards      
Subsequent Event [Line Items]      
Equity grants (in shares)   2,700,000  
Value of stock granted from share-based compensation plans | $   $ 100,000,000  
Initial Formation Awards | Vesting period one      
Subsequent Event [Line Items]      
Percentage of vesting rights for each tranche   25.00%  
Initial Formation Awards | Vesting period two      
Subsequent Event [Line Items]      
Percentage of vesting rights for each tranche   25.00%  
Initial Formation Awards | Vesting period three      
Subsequent Event [Line Items]      
Percentage of vesting rights for each tranche   50.00%  
Long-term incentive partnership units      
Subsequent Event [Line Items]      
Equity grants (in shares) 303,700    
Number of vesting installments under share-based arrangement | installment 4    
Out-performance award units      
Subsequent Event [Line Items]      
Equity grants (in shares) 607,000    
Vesting period for share-based compensation plans 3 years    
Out-performance award units | Vesting period one      
Subsequent Event [Line Items]      
Percentage of vesting rights for each tranche 50.00%    
Out-performance award units | Vesting period two      
Subsequent Event [Line Items]      
Percentage of vesting rights for each tranche 50.00%    
2017 Omnibus Share Plan      
Subsequent Event [Line Items]      
Share-based compensation arrangement, number of shares authorized     10,300,000