Organization and Basis of Presentation - Additional Information (Detail) ft² in Millions	12 Months Ended
	Dec. 31, 2024 ft² Property
Easterly Government Properties LP [Member]
Organization And Significant Accounting Policies [Line Items]
Outstanding common units of aggregate limited partnership interest owned percentage	95.20%
Joint Venture [Member]
Organization And Significant Accounting Policies [Line Items]
Number of properties	10
U.S. General Services Administration [Member]
Organization And Significant Accounting Policies [Line Items]
Percentage of revenue by leasing properties	90.00%
Wholly Owned Operating Properties [Member]
Organization And Significant Accounting Policies [Line Items]
Number of properties	90
Leased percentage of operating properties	97.00%
Aggregate area of land | ft²	9.7
Wholly Owned Operating Properties [Member] | Government [Member]
Organization And Significant Accounting Policies [Line Items]
Number of properties	92
Wholly Owned Operating Properties Entirely Leased [Member] | Government [Member]
Organization And Significant Accounting Policies [Line Items]
Number of properties	4
Wholly Owned Operating Properties Entirely Leased [Member] | Private Tenants [Member]
Organization And Significant Accounting Policies [Line Items]
Number of properties	3
Wholly Owned Properties Under Development [Member]
Organization And Significant Accounting Policies [Line Items]
Number of properties	2
Aggregate area of land | ft²	0.2