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Commitments and Contingencies (Tables) | 9 Months Ended | 12 Months Ended
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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 |

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- Definition Tabular disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph a -Subparagraph 5 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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