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Equity - Noncontrolling Interest (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of activity for noncontrolling interests        
Beginning balance $ 76 $ 84    
Distributions to noncontrolling interests (50) (11) $ (11)  
Other comprehensive income (641) 108 841  
Ending balance 1,208 76 84  
Non- controlling Interests        
Schedule of activity for noncontrolling interests        
Beginning balance 76 84 98 $ 139
Distributions to noncontrolling interests (50) (11) (11) (11)
Other comprehensive income (2)      
Ending balance 1,208 76 84 98
Griffin Capital Essential Asset REIT, Inc. [Member]        
Noncontrolling Interest [Line Items]        
Issuance of limited partnership units     11,941 7,282
Schedule of activity for noncontrolling interests        
Beginning balance 31,105      
Distributions to noncontrolling interests (3,267) (4,369) (4,124) (3,150)
Allocated distributions to noncontrolling interests subject to redemption (10) (13) (11) (10)
Net income 17,275 145,777 26,197 (3,888)
Other comprehensive income 7,500 7,356 2,274 (6,560)
Ending balance 28,723 31,105    
Griffin Capital Essential Asset REIT, Inc. [Member] | Non- controlling Interests        
Noncontrolling Interest [Line Items]        
Issuance of limited partnership units   0 11,941 7,282
Schedule of activity for noncontrolling interests        
Beginning balance 31,105 30,114 21,318 17,478
Distributions to noncontrolling interests (3,267) (4,369) (4,124) (3,150)
Allocated distributions to noncontrolling interests subject to redemption (10) (13) (11) (10)
Net income 671 5,120 912 (138)
Other comprehensive income $ 224 253 78 (144)
Ending balance   $ 31,105 $ 30,114 $ 21,318