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Noncontrolling Interests - Narrative (Details) - shares
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Noncontrolling Interest [Line Items]    
Percentage of noncontrolling interests based on weighted average shares outstanding (percent) 12.03%  
Limited partnership units issued (in shares) 31,900,000  
Limited partnership units with mandatory hold period (in shares) 20,400,000  
Implied EA-1 operating partnership units issued in consideration (in shares) 200,000  
Partnership unit exchange (in shares) 1  
Repurchase of noncontrolling Interest (in shares) 0 6,000
Griffin Capital Essential Asset Operating Partnership, L.P.    
Noncontrolling Interest [Line Items]    
Percentage of noncontrolling interests based on total shares (percent) 12.20%