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Equity Equity - Redemption Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended 24 Months Ended 57 Months Ended 67 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2017
Sep. 30, 2018
Class of Stock [Line Items]                    
Redemption Price Within One Year, Percent           0.00%        
Stock redeemed during period (in shares)       2,791,262   790,941        
Value of shares redeemed       $ 5,292            
Redemption Price Year One, Percent           90.00%        
Redemption Price Year Two, Percent           95.00%        
Redemption Price Year Three, Percent           97.50%        
Redemption Price Year Four and Greater, Percent           100.00%        
Share Redemption Program                    
Class of Stock [Line Items]                    
Minimum holding period for stock to be redeemed from stockholder by the Company           1 year        
Stock redeemed during period (in shares)   585,525 146,083 1,306,834 413,842 623,499 167,442 790,941    
Value of shares redeemed       $ 12,200   $ 5,700 $ 1,600 $ 7,400    
Stock Redeemed or Called During Period, Weighted Average Price per Share   $ 9.65 $ 9.06 $ 9.36 $ 9.18 $ 9.21 $ 9.72 $ 9.32    
Share Redemption Program | Griffin Capital Essential Asset REIT, Inc. [Member]                    
Class of Stock [Line Items]                    
Stock redeemed during period (in shares)   1,311,582 2,936,150 8,013,521 6,155,290 9,931,245 4,164,955      
Value of shares redeemed       $ 76,900   $ 98,900 $ 41,400      
Weighted average price per share (in dollars per share)   $ 9.63 $ 9.97 $ 9.60 $ 9.98 $ 9.96 $ 9.95      
New Share Redemption Program [Member]                    
Class of Stock [Line Items]                    
Minimum holding period for stock to be redeemed from stockholder by the Company       1 year   1 year        
Stock redeemed during period (in shares) 693,487 693,487 0 693,487 0          
Value of shares redeemed                   $ 6,700
Weighted average price per share (in dollars per share)                   $ 9.62
Stock Redeemed or Called During Period, Weighted Average Price per Share   $ 9.62 $ 0.00 $ 9.62 $ 0.00          
Share Redemption Program, Modification or Suspension, Written Notice Required       30 days            
Common Stock | Share Redemption Program                    
Class of Stock [Line Items]                    
Stock redeemed during period (in shares)                   2,097,775
Value of shares redeemed                   $ 19,600
Weighted average price per share (in dollars per share)                   $ 9.34
Common Stock | Share Redemption Program | Griffin Capital Essential Asset REIT, Inc. [Member]                    
Class of Stock [Line Items]                    
Minimum holding period for stock to be redeemed from stockholder by the Company       1 year            
Stock redeemed during period (in shares)                 15,849,898 23,863,419
Value of shares redeemed       $ 234,600   $ 157,700 $ 58,800   $ 157,700 $ 234,600
Weighted average price per share (in dollars per share)     $ 9.92           $ 9.95 $ 9.83