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Real Estate - Consideration Transferred (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Apr. 30, 2019
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
May 01, 2019
shares
Apr. 29, 2019
shares
Real Estate [Line Items]            
GCEAR's common shares outstanding 78,054,934 227,853,720 174,278,341   252,863,421  
Exchange ratio 1.04807          
GCEAR's operating partnership units outstanding 527,045          
Exchange ratio 1.04807          
Implied EA-1 operating partnership units issued in consideration   200,000        
Implied EA-1 common stock and operating partnership units issued in exchange for net assets acquired in Merger | $ $ 751,278 $ 751,277 $ 0 $ 0    
Griffin Capital Essential Asset REIT, Inc.            
Real Estate [Line Items]            
GCEAR's common shares outstanding           167,000,000
Implied EA-1 common stock issued in consideration 74,474,924          
Implied EA-1 operating partnership units issued in consideration 502,872          
EA-1's net asset value per share | $ / shares $ 10.02