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Earnings Per Share - Summary of Basic and Diluted Earnings Per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share Basic And Diluted [Line Items]                      
Net income (loss)                 $ 4,737 $ (6,045) $ 67,785
Non-controlling interest in Operating Partnership                 (1,322) 4,351  
Net income (loss) available to Easterly Government Properties, Inc. $ 1,146 $ 895 $ 699 $ 675 $ 105 $ 498 $ 588 $ (2,885) 3,415 (1,694) $ 2,396
Less: Dividends on participating securities                 (102) (63)  
Net income (loss) available to common stockholders                 $ 3,313 $ (1,757)  
Denominator for basic EPS                 30,645,279 21,430,016  
Denominator for basic and diluted EPS                 32,372,538 21,430,016  
Basic EPS                 $ 0.11 $ (0.08)  
Diluted EPS                 $ 0.10 $ (0.08)  
Stock Compensation Plan [Member]                      
Earnings Per Share Basic And Diluted [Line Items]                      
Dilutive effect                 13,691    
Long Term Incentive Plan [Member]                      
Earnings Per Share Basic And Diluted [Line Items]                      
Dilutive effect                 1,713,568