v3.26.3
Organization and Basis of Presentation - Additional Information (Detail)
ft² in Millions
 9 Months Ended
Apr. 28, 2025
Sep. 30, 2026
ft²
Property
$ / shares
shares
Dec. 31, 2025
$ / shares
shares
Organization And Significant Accounting Policies [Line Items]      
Reverse stock split ratio 0.4    
Reverse unit split ratio 0.4    
Common Stock, shares outstanding | shares   47,321,617 46,303,469
Common Stock, shares authorized | shares   80,000,000 80,000,000
Common Stock, par value | $ / shares   $ 0.01 $ 0.01
Easterly Government Properties LP [Member]      
Organization And Significant Accounting Policies [Line Items]      
Outstanding common units of aggregate limited partnership interest owned percentage   96.70%  
Joint Venture [Member]      
Organization And Significant Accounting Policies [Line Items]      
Number of properties   10  
U.S. General Services Administration [Member] | Minimum [Member]      
Organization And Significant Accounting Policies [Line Items]      
Percentage of revenue by leasing properties   85.00%  
Wholly Owned Operating Properties [Member]      
Organization And Significant Accounting Policies [Line Items]      
Number of properties   96  
Leased percentage of operating properties   98.00%  
Aggregate area of land | ft²   10.7  
Wholly Owned Operating Properties [Member] | Government [Member]      
Organization And Significant Accounting Policies [Line Items]      
Number of properties   93  
Wholly Owned Operating Properties Entirely Leased [Member] | Private Tenants [Member]      
Organization And Significant Accounting Policies [Line Items]      
Number of properties   5  
Wholly Owned Properties Under Development [Member]      
Organization And Significant Accounting Policies [Line Items]      
Number of properties   3  
Aggregate area of land | ft²   0.2