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Real Estate - Narrative (Details) $ in Thousands, ft² in Millions |  |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 20, 2017 USD ($) | Oct. 19, 2017 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) ft² state Property building property parcel | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) ft² state Property building property | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Real Estate [Line Items] |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  | 10 years 3 months 18 days | 11 years 4 months 24 days |
Number of properties | Property |  |  |  | 27 |  | 27 |  |
Number of Buildings | building |  |  |  | 35 |  | 35 |  |
Number of states | state |  |  |  | 17 |  | 17 |  |
Depreciation |  |  |  | $ 15,284 | $ 15,053 | $ 20,194 | $ 11,630 | $ 4,916
Amortization expense |  |  |  | 18,099 | 17,657 | 23,756 | $ 16,264 | 7,145
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  |  | $ 1,100,000 |  | $ 1,100,000 |  |
Approx. Square Feet | ft² |  |  |  | 7.3 |  | 7.3 |  |
Amortization |  |  |  | $ 18,100 |  | $ 23,800 |  |
Minimum |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Real Estate Acquisition, As-if-Vacant Valuation, Discount Rate |  |  |  |  |  | 5.75% |  |
Maximum |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Real Estate Acquisition, As-if-Vacant Valuation, Discount Rate |  |  |  |  |  | 8.25% |  |
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Number Of Properties Serving As Collateral | property |  |  |  |  |  | 8 |  |
Gain (Loss) on Termination of Lease |  |  |  |  |  | $ 12,800 |  |
Finance Lease, Weighted Average Remaining Lease Term |  |  |  |  |  | 6 years 6 months 4 days | 7 years 1 month 6 days |
Number of properties | property |  |  |  | 76 |  | 73 |  |
Number of states | state |  |  |  | 20 |  | 20 |  |
Number of land parcels held for future development | parcel |  |  |  | 2 |  |  |  |
Purchase price |  |  |  | $ 3,000,000 |  | $ 2,800,000 |  |
Depreciation |  |  |  | 44,390 | 42,244 | 55,982 | $ 56,707 | 43,320
Amortization expense |  |  |  | 44,868 | 46,539 | $ 60,601 | $ 74,142 | $ 69,428
Lease Termination Fee Payment Period |  |  |  |  |  | 2 years |  |
Quarterly Lease Termination Fee Payment |  |  |  |  |  | $ 1,600 |  |
Unamortized In-Place Lease Intangible Assets Accelerated As A Result Of Lease Termination |  |  |  |  |  | 3,400 |  |
Deferred Rent Revenue Recognized During Period |  |  |  | $ 10,210 | $ 8,508 | 400 |  |
Impairment Provision Related To Lease Intangibles |  |  |  |  |  | 5,700 |  |
Real Estate Not Recoverable |  |  |  |  |  | $ 2,800 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Discount rate |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Discount rate (percent) |  |  |  |  |  | 0.07 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Discount rate | Minimum |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Discount rate (percent) |  |  |  | 0.0625 |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Discount rate | Maximum |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Discount rate (percent) |  |  |  | 0.0775 |  |  |  |
12669 Encinitas Avenue [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of property |  |  | $ 10,000 |  |  |  |  |
Real Estate Investments, Net |  |  | 5,400 |  |  |  |  |
Gains (Losses) on Sales of Investment Real Estate |  |  | $ 4,000 |  |  |  |  |
One Century Plaza, Nashville, TN [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of property |  | $ 100,000 |  |  |  |  |  |
Real Estate Investments, Net |  | 67,900 |  |  |  |  |  |
Gains (Losses) on Sales of Investment Real Estate |  | $ 32,100 |  |  |  |  |  |
DreamWorks Property [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of property | $ 290,000 |  |  |  |  |  |  |
Real Estate Investments, Net | 210,100 |  |  |  |  |  |  |
Gains (Losses) on Sales of Investment Real Estate | $ 79,900 |  |  |  |  |  |  |

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