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Noncontrolling Interest (Details) - USD ($) |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 16, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 11, 2014
Schedule of activity for noncontrolling interests |  |  |  |  |  |
Beginning balance |  | $ 76,000 | $ 84,000 |  |  |
Issuance of limited partnership units |  | 1,185,000 |  |  |  |
Distributions to noncontrolling interests |  | (50,000) | (11,000) | $ (11,000) |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Distributions to Redeemable Preferred Units, and Preferred Unit Redemption Charges |  | (431,000) | 11,119,000 | (6,107,000) | $ (17,277,000) |
Other comprehensive income |  | (641,000) | 108,000 | 841,000 |  |
Ending balance |  | 1,208,000 | 76,000 | 84,000 |  |
Non- controlling Interests |  |  |  |  |  |
Schedule of activity for noncontrolling interests |  |  |  |  |  |
Beginning balance |  | 76,000 | 84,000 | 98,000 | 139,000 |
Issuance of limited partnership units |  | 1,185,000 | 0 |  |  |
Distributions to noncontrolling interests |  | (50,000) | (11,000) | (11,000) | (11,000) |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Distributions to Redeemable Preferred Units, and Preferred Unit Redemption Charges |  | (1,000) | 3,000 | (3,000) | (30,000) |
Other comprehensive income |  | (2,000) |  |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest |  |  | 0 |  |  |
Ending balance |  | $ 1,208,000 | $ 76,000 | $ 84,000 | $ 98,000 |
Griffin Capital Essential Asset Operating Partnership, L.P. [Member] |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Limited Partners' Capital Account, Number of Common Shares That Can Be Issued for Each Partnership Unit Redeemed |  | 1 |  |  |  |
Limited Partner Account, Redemption, Minimum Period Outstanding Required |  | 1 year |  |  |  |
Operating Partnership [Member] |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Percentage of noncontrolling interests based on total shares (percent) |  |  | 0.03% |  |  |
Limited Partner [Member] | Griffin Capital Essential Asset Operating Partnership, L.P. [Member] |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Limited Partners' Capital Account, Units Issued |  |  |  |  |  | 20,000
Stock purchase price (usd per share) |  |  |  |  |  | $ 10
Limited Partner [Member] | Operating Partnership [Member] |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Limited Partners' Capital Account, Units Issued |  |  |  |  |  | 20,000
Stock purchase price (usd per share) |  |  |  |  |  | $ 10
Partnership unit exchange (in shares) |  |  | 1 |  |  |
Griffin Capital Essential Asset Advisor II, LLC [Member] |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Limited Partners' Capital Account, Units Issued | 123,779 |  |  |  |  |
Stock purchase price (usd per share) | $ 9.57 |  |  |  |  |
Performance Distribution, Percentage of Allocation | 50.00% |  |  |  |  |
Shares Outstanding [Member] | Griffin Capital Essential Asset Operating Partnership, L.P. [Member] |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Percentage of noncontrolling interests based on total shares (percent) |  | 0.18% |  |  |  |
Weighted Average Shares Outstanding [Member] | Griffin Capital Essential Asset Operating Partnership, L.P. [Member] |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Percentage of noncontrolling interests based on total shares (percent) |  | 0.16% |  |  |  |

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