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Related Party Transactions - Narrative (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 16, 2018 | Sep. 20, 2017 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Average invested assets percentage |  |  |  |  |  | 2.00% |  |
Operating expenses |  |  |  | $ 19,051 | $ 16,502 | $ 22,272 | $ 66,819 | $ 47,207
Property management fees percentage |  |  |  |  |  | 3.00% |  |
Gross revenue percentage |  |  |  |  |  | 1.00% |  |
Construction management fee percentage |  |  |  |  |  | 5.00% |  |
Underwriting Compensation Percentage of Gross Proceeds Received |  |  |  | 9.00% |  | 9.00% |  |
Related Party Transaction, Shares Outstanding |  |  | 563,440 | 563,440 |  |  |  |
Griffin Capital Essential Asset Advisor II, LLC [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related Party Transaction, Shares Sold |  | 263,992 |  |  |  |  |  |
Related Party Transaction, Proceeds from Sell of Shares |  | $ 2,500 |  |  |  |  |  |
Advisor and Property Manager Fees - Performance Distribution [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Performance Distribution, Percentage Of Total Return |  |  |  | 12.50% |  | 12.50% |  |
Operating expenses |  |  |  | $ 6,200 | 213 | $ 2,394 | 0 | $ 0
Performance Distribution, Hurdle Rate, Annualized Rate Of Return On Net Asset Value |  |  |  | 5.50% |  | 5.50% |  |
Performance Distribution, Distribution Percentage On Excess Profits Before Threshold |  |  |  |  |  | 100.00% |  |
Performance Distribution, Distribution Threshold |  |  |  |  |  | 12.50% |  |
Performance Distribution, Distribution Percentage On Excess Profits After Threshold |  |  |  |  |  | 12.50% |  |
Related Party Transaction, Amounts of Transaction | $ 1,200 |  |  |  |  |  |  |
Reimbursement, Services Provided That Are not Entitled to Advisor Fees | Griffin Capital Essential Asset Advisor II, LLC [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Operating expenses |  |  |  | $ 600 | 500 |  |  |
Reimbursement, Services Provided That Are not Entitled to Advisor Fees | Griffin Capital Essential Asset Advisor, LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  | $ 700 | 500 |
Reimbursement, Reimbursable Expenses |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Average invested assets percentage |  |  |  | 2.00% |  |  |  |
Sales revenue goods percentage |  |  |  | 25.00% |  | 25.00% |  |
Reimbursement, Reimbursable Expenses | Griffin Capital Essential Asset Advisor II, LLC [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Operating expenses |  |  |  | $ 70 | 100 |  |  |
Reimbursement, Reimbursable Expenses | Griffin Capital Essential Asset Advisor, LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  | $ 200 |  |
Dealer Manager Agreement [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Dealer Manager Fee Percentage |  |  |  |  |  | 0.50% |  |
Underwriting Compensation Percentage of Gross Proceeds Received |  |  |  | 10.00% |  | 10.00% |  |
Dealer Distribution Fee [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Underwriting Compensation Percentage of Gross Proceeds Received |  |  |  | 9.00% |  | 9.00% |  |
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Percentage of acquisition fees (percent) |  |  |  | 2.50% |  | 2.50% |  |
Percent reimbursed (percent) |  |  |  | 0.50% |  | 0.50% |  |
Percentage of purchase price of properties |  |  |  | 0.60% |  | 0.60% |  |
Percentage of contract purchase price |  |  |  | 6.00% |  | 6.00% |  |
Disposition fee, percent of contract sales price |  |  |  | 3.00% |  | 3.00% |  |
Disposition fee, percent of competitive commission |  |  |  | 50.00% |  | 50.00% |  |
Disposition fee, percent of aggregate contract sales price |  |  |  | 6.00% |  | 6.00% |  |
Asset management fee percentage of average invested assets |  |  |  | 0.75% |  | 0.75% |  |
Average invested assets percentage |  |  |  | 2.00% |  | 2.00% |  |
Sales revenue goods percentage |  |  |  | 25.00% |  | 25.00% |  |
Property management fees percentage |  |  |  | 3.00% |  | 3.00% |  |
Gross revenue percentage |  |  |  | 1.00% |  | 1.00% |  |
Construction management fee percentage |  |  |  | 5.00% |  | 5.00% |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Griffin Capital Essential Asset Advisor, LLC | Executive Officer [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  | $ 600 | 400 |
Griffin Capital Essential Asset REIT, Inc. [Member] | Griffin Capital Essential Asset Advisor, LLC | Officer [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  | $ 200 | $ 200 |
Griffin Capital Essential Asset REIT, Inc. [Member] | Reimbursement, Services Provided That Are not Entitled to Advisor Fees | Griffin Capital Essential Asset Advisor, LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Operating expenses |  |  | $ 400 |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Reimbursement, Reimbursable Expenses | Griffin Capital Essential Asset Advisor, LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Operating expenses |  |  | $ 200 |  | $ 100 |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Share of Net Sale Proceeds | Griffin Capital Essential Asset Advisor, LLC | Affiliated Entity |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Determination of compensation, minimum required cumulative, non-compounded return to shareholders, percentage |  |  |  | 6.00% |  | 6.00% |  |
Compensation rate, cumulative, non-compounded return to shareholders, range one, percentage |  |  |  | 5.00% |  | 5.00% |  |
Compensation rate, cumulative, non-compounded return to shareholders, range two, percentage |  |  |  | 10.00% |  | 10.00% |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range three, percentage |  |  |  | 10.00% |  | 10.00% |  |
Compensation rate, cumulative, non-compounded return to shareholders, range three, percentage |  |  |  | 15.00% |  | 15.00% |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Share of Net Sale Proceeds | Griffin Capital Essential Asset Advisor, LLC | Minimum | Affiliated Entity |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range one, percentage |  |  |  | 6.00% |  | 6.00% |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range two, percentage |  |  |  | 8.00% |  | 8.00% |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Share of Net Sale Proceeds | Griffin Capital Essential Asset Advisor, LLC | Maximum | Affiliated Entity |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range one, percentage |  |  |  | 8.00% |  | 8.00% |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range two, percentage |  |  |  | 10.00% |  | 10.00% |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Incentive Listing Distribution | Griffin Capital Essential Asset Advisor, LLC | Affiliated Entity |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Determination of compensation, minimum required cumulative, non-compounded return to shareholders, percentage |  |  |  | 6.00% |  | 6.00% |  |
Compensation rate, cumulative, non-compounded return to shareholders, range one, percentage |  |  |  | 5.00% |  | 5.00% |  |
Compensation rate, cumulative, non-compounded return to shareholders, range two, percentage |  |  |  | 10.00% |  | 10.00% |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range three, percentage |  |  |  | 10.00% |  | 10.00% |  |
Compensation rate, cumulative, non-compounded return to shareholders, range three, percentage |  |  |  | 15.00% |  | 15.00% |  |
Compensation payable, number of trading days |  |  |  | 30 days |  | 30 days |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Incentive Listing Distribution | Griffin Capital Essential Asset Advisor, LLC | Minimum | Affiliated Entity |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range one, percentage |  |  |  | 6.00% |  | 6.00% |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range two, percentage |  |  |  | 8.00% |  | 8.00% |  |
Compensation payable, distribution period |  |  |  | 7 months |  | 7 months |  |
Compensation payable, 30 day commencement period |  |  |  | 6 months |  | 6 months |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Incentive Listing Distribution | Griffin Capital Essential Asset Advisor, LLC | Maximum | Affiliated Entity |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range one, percentage |  |  |  | 8.00% |  | 8.00% |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range two, percentage |  |  |  | 10.00% |  | 10.00% |  |
Compensation payable, distribution period |  |  |  | 19 months |  | 19 months |  |
Compensation payable, 30 day commencement period |  |  |  | 18 months |  | 18 months |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Distribution Due Upon Termination | Griffin Capital Essential Asset Advisor, LLC | Affiliated Entity |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Determination of compensation, minimum required cumulative, non-compounded return to shareholders, percentage |  |  |  | 6.00% |  | 6.00% |  |
Compensation rate, cumulative, non-compounded return to shareholders, range one, percentage |  |  |  | 5.00% |  | 5.00% |  |
Compensation rate, cumulative, non-compounded return to shareholders, range two, percentage |  |  |  | 10.00% |  | 10.00% |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range three, percentage |  |  |  | 10.00% |  | 10.00% |  |
Compensation rate, cumulative, non-compounded return to shareholders, range three, percentage |  |  |  | 15.00% |  | 15.00% |  |
Compensation payable, percent owed within first 30 days |  |  |  | 33.33% |  | 33.33% |  |
Compensation payable, termination date range one |  |  |  | 30 days |  | 30 days |  |
Compensation payable, percent owed at one year anniversary |  |  |  | 33.33% |  | 33.33% |  |
Compensation payable, termination date range two |  |  |  | 1 year |  | 1 year |  |
Compensation payable, percent owed at two year anniversary |  |  |  | 33.33% |  | 33.33% |  |
Compensation payable, termination date range three |  |  |  | 2 years |  | 2 years |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Distribution Due Upon Termination | Griffin Capital Essential Asset Advisor, LLC | Minimum | Affiliated Entity |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range one, percentage |  |  |  | 6.00% |  | 6.00% |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range two, percentage |  |  |  | 8.00% |  | 8.00% |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Distribution Due Upon Termination | Griffin Capital Essential Asset Advisor, LLC | Maximum | Affiliated Entity |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range one, percentage |  |  |  | 8.00% |  | 8.00% |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range two, percentage |  |  |  | 10.00% |  | 10.00% |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Distribution Due Upon Extraordinary Transaction | Griffin Capital Essential Asset Advisor, LLC | Affiliated Entity |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Determination of compensation, minimum required cumulative, non-compounded return to shareholders, percentage |  |  |  | 6.00% |  | 6.00% |  |
Compensation rate, cumulative, non-compounded return to shareholders, range one, percentage |  |  |  | 5.00% |  | 5.00% |  |
Compensation rate, cumulative, non-compounded return to shareholders, range two, percentage |  |  |  | 10.00% |  | 10.00% |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range three, percentage |  |  |  | 10.00% |  | 10.00% |  |
Compensation rate, cumulative, non-compounded return to shareholders, range three, percentage |  |  |  | 15.00% |  | 15.00% |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Distribution Due Upon Extraordinary Transaction | Griffin Capital Essential Asset Advisor, LLC | Minimum | Affiliated Entity |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range one, percentage |  |  |  | 6.00% |  | 6.00% |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range two, percentage |  |  |  | 8.00% |  | 8.00% |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Distribution Due Upon Extraordinary Transaction | Griffin Capital Essential Asset Advisor, LLC | Maximum | Affiliated Entity |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range one, percentage |  |  |  | 8.00% |  | 8.00% |  |
Determination of compensation, cumulative, non-compounded return to shareholders, range two, percentage |  |  |  | 10.00% |  | 10.00% |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Compensation, Subordinated Distribution Due Upon Extraordinary Transaction | Griffin Capital Corporation | Affiliated Entity |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Excess merger consideration, trading restriction on stock from date of receipt |  |  |  | 1 year |  | 1 year |  |
Common Class T [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Stockholder Servicing Fee, Daily Accrual Rate |  |  |  | 0.00274% |  | 0.00274% |  |
Common Class T [Member] | Dealer Manager Agreement [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Stockholder Servicing Fee, Daily Accrual Rate |  |  |  | 0.00274% |  | 0.00274% |  |
Related Party Fee Percentage, Sales Commission On Stock Offering |  |  |  |  |  | 3.00% |  |
Common Class T [Member] | Dealer Distribution Fee [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Stockholder Servicing Fee, Daily Accrual Rate |  |  |  | 0.00068% |  | 0.00068% |  |
Common Class T [Member] | Advisor Distribution Fee [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Stockholder Servicing Fee, Daily Accrual Rate |  |  |  | 0.00205% |  | 0.00205% |  |
Common Class T [Member] | Advisory Agreement [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Stockholder Servicing Fee, Daily Accrual Rate |  |  |  | 0.00342% |  | 0.00342% |  |
Common Class S [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Stockholder Servicing Fee, Daily Accrual Rate |  |  |  | 0.00274% |  | 0.00274% |  |
Common Class S [Member] | Dealer Manager Agreement [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related Party Fee Percentage, Sales Commission On Stock Offering |  |  |  |  |  | 3.50% |  |
Common Class D [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Stockholder Servicing Fee, Daily Accrual Rate |  |  |  | 0.00068% |  | 0.00068% |  |
Common Class AA [Member] | Dealer Manager Agreement [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Stockholder Servicing Fee, Daily Accrual Rate |  |  |  | 0.00274% |  | 0.00274% |  |
Limited Partnership Units [Member] | Advisor and Property Manager Fees - Performance Distribution [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction | $ 1,200 |  |  |  |  |  |  |
Related Party Transaction, Cash Election | 50.00% |  |  |  |  |  |  |

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