| Document and Entity Information | Aug. 04, 2020 |
| Cover [Abstract] | |
| Entity Registrant Name | Easterly Government Properties, Inc. |
| Document Type | 8-K |
| Amendment Flag | false |
| Entity Central Index Key | 0001622194 |
| Document Period End Date | Aug. 4, 2020 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-36834 |
| Entity Incorporation, State or Country Code | MD |
| Entity Tax Identification Number | 47-2047728 |
| Entity Address, Address Line One | 2101 L Street NW |
| Entity Address, Address Line Two | Suite 650 |
| Entity Address, City or Town | Washington |
| Entity Address, State or Province | DC |
| Entity Address, Postal Zip Code | 20037 |
| City Area Code | (202) |
| Local Phone Number | 595-9500 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of each class | Common Stock |
| Trading Symbol | DEA |
| Name of each exchange on which registered | NYSE |
