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Commitments and Contingencies (Tables)
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Griffin Capital Essential Asset REIT, Inc. [Member]    
Other Commitments [Line Items]    
Summary of remaining required payments under the terms of the ground lease
As of September 30, 2018, the remaining required payments under the terms of the ground leases are as follows:
 
September 30, 2018
Remaining 2018
$
258

2019
1,032

2020
1,032

2021
1,032

2022
1,072

Thereafter
200,446

Total
$
204,872

As of December 31, 2017, the remaining required payments under the terms of the ground lease are as follows:
 
December 31, 2017
2018
$
198

2019
198

2020
198

2021
198

2022
218

Thereafter
33,631

Total
$
34,641