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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) segment Segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  | $ 0 |  |
Restricted Cash and Cash Equivalents | $ 14,642,000 |  | $ 14,642,000 |  | 12,886,000 | $ 14,221,000 |
Cash Equivalents, at Carrying Value |  |  |  |  | 0 | 0 |
Cash, FDIC Insured Amount |  |  |  |  | $ 250,000 |  |
Number of reportable segments | segment |  |  | 1 |  | 1 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Restricted Cash and Cash Equivalents | 22,365,000 |  | $ 22,365,000 |  | $ 174,132,000 | 13,420,000 |
Impairment provision | $ 0 | $ 0 | $ 0 | $ 5,675,000 | 8,460,000 | 0 | $ 0
Cash Equivalents, at Carrying Value |  |  |  |  | 0 | 0 |
Cash, FDIC Insured Amount |  |  |  |  | $ 250,000 |  |
Number of reportable segments |  |  | 1 |  | 1 |  |
Building [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  | 40 years |  |
Minimum | Building [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  | 25 years |  |
Minimum | Building Improvements [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  | 5 years |  |
Minimum | Building Improvements [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  | 5 years |  |
Minimum | Land Improvements [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  | 15 years |  |
Minimum | Land Improvements [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  | 15 years |  |
Maximum | Building [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  | 40 years |  |
Maximum | Building Improvements [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  | 20 years |  |
Maximum | Building Improvements [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  | 20 years |  |
Maximum | Land Improvements [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  | 25 years |  |
Maximum | Land Improvements [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  | 25 years |  |
Section 1031 Exchanges [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Restricted Cash |  |  |  |  | $ 154,900,000 | $ 0 |

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