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Related Party Transactions - Schedule of Related Parties (Details) $ in Thousands, ft² in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) ft² | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) ft² | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 20, 2017 USD ($) ft²
Related Party Transaction [Line Items] |  |  |  |  |  |
Approx. Square Feet | ft² | 7.3 |  | 7.3 |  |  |
Real Estate Investment Property, at Cost | $ 1,182,057 |  | $ 1,178,866 | $ 1,133,055 |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 19,051 | $ 16,502 | 22,272 | 66,819 | $ 47,207 |
Payable | $ 18,988 |  | $ 16,896 | 22,481 |  |
Underwriting Compensation Percentage of Gross Proceeds Received | 9.00% |  | 9.00% |  |  |
Advisor and Property Manager Fees - Acquisition Fees and Expenses [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Approx. Square Feet | ft² |  |  |  |  |  | 1.0
Real Estate Investment Property, at Cost |  |  |  |  |  | $ 80,000
Schedule of related party transactions |  |  |  |  |  |
Incurred |  |  | $ 0 | 6,324 | 11,438 |
Payable |  |  | 0 | 0 |  |
Operating expenses |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | $ 2,168 | 1,677 | 2,336 | 1,622 | 1,911 |
Payable | 806 |  | 658 | 18 |  |
Asset management fees |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 0 | 8,027 | 8,027 | 6,413 | 2,624 |
Payable | 0 |  | 0 | 807 |  |
Property Management Fees [Member] |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 1,365 | 1,347 | 1,799 | 1,052 | 333 |
Payable | 153 |  | 158 | 143 |  |
Acquisition fees |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 0 | 1,099 | 1,099 | 7,606 | 0 |
Payable | 0 |  | 0 | 0 |  |
Advisor and Property Manager Fees - Performance Distribution [Member] |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 6,200 | 213 | 2,394 | 0 | 0 |
Payable | 6,224 |  | 2,394 | 0 |  |
Advisor and Property Manager Fees - Advisory Fees [Member] |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 6,970 | 273 | 2,550 | 0 | 0 |
Payable | 784 |  | 762 | 0 |  |
Contingent Advisor Payment Holdback - Organization and Offering Expenses [Member] |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 1,113 | 250 | 192 | 0 | 3,150 |
Payable | 1,305 |  | 192 | 0 |  |
Other Costs Advanced by Advisor [Member] |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 938 | 604 | 662 | 304 | 2,598 |
Payable | $ 319 |  | 285 | 12 |  |
Advisor and Property Manager Fees - Preferred Offering Costs [Member] |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred |  |  | 0 | 0 | 375 |
Payable |  |  | $ 0 | 0 |  |
Dealer Manager Agreement [Member] |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Underwriting Compensation Percentage of Gross Proceeds Received | 10.00% |  | 10.00% |  |  |
Advisor and Property Manager Fees - Selling Commissions [Member] |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | $ 66 | 1,127 | $ 1,128 | 11,397 | 16,303 |
Payable | 0 |  | 0 | 54 |  |
Advisor and Property Manager Fees - Dealer Manager Fees [Member] |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 11 | 393 | 393 | 3,949 | 7,303 |
Payable | 0 |  | 0 | 18 |  |
Advisor and Property Manager Fees - Stockholder Servicing Fee [Member] |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 175 | 565 | 660 | 17,449 | 25 |
Payable | 9,353 |  | 12,377 | 16,020 |  |
Advisor Advances - Organization and Offering Expenses [Member] |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 45 | 136 | 179 | 2,634 | 382 |
Payable | 44 |  | 8 | 2,477 |  |
Contingent Advisor Payment Holdback - Dealer Manager Fees [Member] |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 0 | 791 | 853 | 8,069 | 765 |
Payable | 0 |  | 62 | 2,932 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Real Estate Investment Property, at Cost | 3,077,761 |  | 2,865,753 | 3,024,389 |  |
Schedule of related party transactions |  |  |  |  |  |
Payable | 4,018 |  | 3,535 | 2,719 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Advisor and Property Manager Fees - Acquisition Fees and Expenses [Member] |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred |  |  | 0 | 1,322 | 35,210 |
Payable |  |  | 0 | 0 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Operating expenses |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 2,630 | 1,983 | 2,652 | 1,525 | 1,608 |
Payable | 949 |  | 670 | 0 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Asset Management Fees 2 [Member] |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 17,628 | 17,744 |  |  |  |
Payable | 1,999 |  | 1,873 |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Asset management fees |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred |  |  | 23,499 | 23,530 | 19,389 |
Payable |  |  | 1,878 | 1,982 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Property Management Fees [Member] |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 6,992 | 7,466 |  |  |  |
Payable | 746 |  | 725 |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Property management fees |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred |  |  | 9,782 | 9,740 | 7,622 |
Payable |  |  | 730 | 737 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Costs advanced by the Advisor |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 396 | 419 | 587 | 73 | 53 |
Payable | 324 |  | 267 | 0 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Acquisition fees |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 5,331 | 0 | 3,791 | 0 | 0 |
Payable | 0 |  | 0 | 0 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Leasing commissions |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 0 | 1,752 | 1,752 | 0 | 2,105 |
Payable | 0 |  | 0 | 0 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Costs Capitalized [Member] |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 32,977 | 29,364 |  |  |  |
Payable | 4,018 |  | 3,535 |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Total, including real estate assets held for sale |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 33,076 | 29,459 | 44,013 | 36,190 | 66,627 |
Payable | 4,023 |  | 3,545 | 2,719 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Disposition Fees [Member] |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred |  |  | 1,950 | 0 | $ 640 |
Payable |  |  | 0 | $ 0 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Held-for-sale | Asset management fees |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 42 | 42 |  |  |  |
Payable | 5 |  | 5 |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Held-for-sale | Property Management Fees [Member] |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Incurred | 57 | $ 53 |  |  |  |
Payable | $ 0 |  | $ 5 |  |  |
Common Class AA [Member] | Dealer Manager Agreement [Member] |  |  |  |  |  |
Schedule of related party transactions |  |  |  |  |  |
Related Party Stockholder Servicing Fee for Issuance of Shares, Percent | 4.00% |  | 4.00% |  |  |

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