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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Operating Leased Assets [Line Items]        
2018     $ 71,662  
Remaining 2018 $ 19,311      
2019 78,887   78,887  
2020 80,492   80,492  
2021 72,677   72,677  
2022 73,538   73,538  
Thereafter 528,803   528,803  
Total 853,708   906,059  
Griffin Capital Essential Asset REIT, Inc. [Member]        
Operating Leased Assets [Line Items]        
Rent expense     400 $ 400
2018     231,620  
Remaining 2018 61,164      
2019 226,557   210,449  
2020 204,640   188,653  
2021 191,182   174,053  
2022 182,708   164,494  
Thereafter 803,849   664,226  
Total 1,670,100   1,633,495  
Griffin Capital Essential Asset REIT, Inc. [Member] | Ground Lease        
Operating Leased Assets [Line Items]        
Rent expense 1,300 $ 1,300    
2018     198  
Remaining 2018 258      
2019 1,032   198  
2020 1,032   198  
2021 1,032   198  
2022 1,072   218  
Thereafter 200,446   33,631  
Total $ 204,872   $ 34,641