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Schedule III - Real Estate and Accumulated Depreciation Schedule III - Real Estate and Accumulated Depreciation - Rollforward of Accumulated Depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2018
Real estate facilities        
Balance at beginning of year $ 1,133,055 $ 516,965 $ 0  
Acquisitions 45,016 615,972 516,965  
Improvements 576 38 0  
Construction-in-progress 219 80 0  
Balance at end of year 1,178,866 1,133,055 516,965  
Accumulated depreciation        
Balance at beginning of year 39,955 12,061 0  
Depreciation and amortization expense 43,950 27,894 12,061  
Balance at end of year 83,905 39,955 12,061  
Total real estate, net 1,094,961 1,093,100 504,904 $ 1,064,769
Griffin Capital Essential Asset REIT, Inc. [Member]        
Real estate facilities        
Balance at beginning of year 3,024,389 2,968,982 1,823,895  
Acquisitions 133,747 42,438 1,087,153  
Improvements 12,479 16,792 7,382  
Construction-in-progress 1,752 575 45,067  
Other adjustments (2,785) (4,398) 0  
Real estate assets held and used 0 0 70,907  
Write down of tenant origination and absorption costs (2,352) 0 0  
Sale of real estate assets (297,902) 0 (65,422)  
Balance at end of year 2,869,328 3,024,389 2,968,982  
Accumulated depreciation        
Balance at beginning of year 338,552 208,933 102,883  
Depreciation and amortization expense 116,583 130,849 112,748  
Depreciation expense (held and used adjustment) 0 0 4,621  
Less: Non-real estate assets depreciation expense (1,554) (1,230) (328)  
Less: Sale of real estate assets depreciation expense (26,829) 0 (10,991)  
Balance at end of year 426,752 338,552 208,933  
Total real estate, net $ 2,439,795 $ 2,685,837 $ 2,760,049 $ 2,564,832