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Real Estate - Aggregate Purchase Price (Details) |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2017 USD ($) | Nov. 02, 2015 | Sep. 30, 2018 USD ($) ft² | Dec. 31, 2017 USD ($) ft² | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Real Estate [Line Items] |  |  |  |  |  |
Related Party Acquisition Fee for Purchase of Property, Base Rate |  |  |  | 2.00% |  |
Acquisitions |  |  |  | $ 45,016,000 | $ 615,972,000 | $ 516,965,000
Approx. Square Feet | ft² |  |  | 7,300,000 | 7,300,000 |  |
Related Party Acquisition, Percentage of Acquisition Value |  |  |  | 1.00% |  |
Related Party Acquisition Fee for Purchase of Property |  | 3.85% |  |  |  |
Related Party Acquisition Fee for Purchase of Property, Contingent Rate |  | 1.85% |  |  |  |
Acquisition Fee, Amount Retained Subject to Conditions |  |  |  | $ 5,000,000 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Acquisitions |  |  |  | $ 133,747,000 | $ 42,438,000 | $ 1,087,153,000
Acquisition Fees and Expenses |  |  | $ 5,700,000 |  |  |
Percentage of acquisition fees (percent) |  |  | 2.50% | 2.50% |  |
Percent reimbursed (percent) |  |  | 0.50% | 0.50% |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | HealthSpring [Member] |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Purchase Price |  |  |  | $ 130,000,000 |  |
Approx. Square Feet | ft² |  |  |  | 451,600 |  |
Acquisition Fees and Expenses |  |  |  | $ 3,791,000 |  |
Percentage of acquisition fees (percent) |  |  |  | 2.50% |  |
Percent reimbursed (percent) |  |  |  | 0.50% |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Quaker Property [Member] |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Purchase Price |  |  | $ 59,600,000 |  |  |
Approx. Square Feet | ft² |  |  | 605,400 |  |  |
Acquisition Fees and Expenses |  |  | $ 1,777,000 |  |  |
Percentage of acquisition fees (percent) |  |  | 2.50% |  |  |
Percent reimbursed (percent) |  |  | 0.50% |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | McKesson Property [Member] |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Purchase Price |  |  | $ 67,000,000 |  |  |
Approx. Square Feet | ft² |  |  | 271,100 |  |  |
Acquisition Fees and Expenses |  |  | $ 2,139,000 |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Shaw Property [Member] |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Purchase Price |  |  | $ 56,526,000 |  |  |
Approx. Square Feet | ft² |  |  | 1,001,500 |  |  |
Acquisition Fees and Expenses |  |  | $ 1,782,000 |  |  |
The Allstate Property [Member] |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Acquisitions |  |  |  | $ 14,750,000 |  |
Approx. Square Feet | ft² |  |  |  | 70,300 |  |
Acquisition Fees and Expenses |  |  |  | $ 1,200,000 |  |
Acquisition Related Costs to Affiliates |  |  |  | 402,000 |  |
Line of Credit Draw |  |  |  | 273,000 |  |
Business Combination, Consideration Transferred |  |  |  | 14,800,000 |  |
MISO Property [Member] |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Acquisitions |  |  |  | $ 28,600,000 |  |
Approx. Square Feet | ft² |  |  |  | 133,400 |  |
Acquisition Related Costs to Affiliates |  |  |  | $ 696,000 |  |
Line of Credit Draw |  |  |  | $ 529,000 |  |
Contingent Advisor Payment Holdback - Organization and Offering Expenses and Dealer Manager Fees [Member] |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Payments of Contingent Advisor Payment Holdback | $ 5,000,000.0 |  |  |  |  |

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- Definition The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(3)(ii)(A)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 + Details
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