Earnings Per Share - Summary of Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share Basic And Diluted [Line Items]
Net income		$ 20,578	$ 21,060	$ 35,562
Less: Non-controlling interest in Operating Partnership		(1,025)	(2,256)	(4,088)
Net income available to Easterly Government Properties, Inc.		19,553	18,804	31,474
Less: Dividends on participating securities		(554)	(599)	(546)
Net income available to common stockholders		$ 18,999	$ 18,205	$ 30,928
Denominator for basic EPS		103,443,951	94,264,166	90,613,966
Denominator for diluted EPS		103,758,546	94,556,055	90,948,701
Basic EPS		$ 0.18	$ 0.19	$ 0.34
Diluted EPS		$ 0.18	$ 0.19	$ 0.34
Stock Compensation Plan [Member]
Earnings Per Share Basic And Diluted [Line Items]
Dilutive effect		19,548	18,128	19,336
Long Term Incentive Plan
Earnings Per Share Basic And Diluted [Line Items]
Dilutive effect	[1]	295,047	269,685	315,399
Forward Sales Agreements [Member]
Earnings Per Share Basic And Diluted [Line Items]
Dilutive effect	[2]	0	4,076

[1] During the years ended December 31, 2024, 2023 and 2022, there were approximately 415,291, 387,010 and 314,529 unvested performance-based LTIP units, respectively, that were not included in the computation of diluted earnings per share because to do so would have been antidilutive for the period.

[2] During the years ended December 31, 2024 and 2023, there were no shares of underlying unsettled forward sales transactions that were included in the computation of diluted earnings per share because to do so would have been antidilutive for the period. During the year ended December 31, 2022, 4,259,000 shares of underlying unsettled forward sales transactions that were not included in the computation of diluted earnings per share because to do so would have been antidilutive for the period.