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Interest Rate Contracts - Narrative (Details) |  |  | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2018 USD ($) | Apr. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Nov. 01, 2017 USD ($) | Dec. 31, 2016 USD ($) | Apr. 01, 2016 USD ($) | Feb. 25, 2016 USD ($) | Jul. 09, 2015 contract
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  | $ 300,000 | $ (1,000,000) |  |  |  |  |
Derivative Asset |  |  | 310,000 | 1,032,000 |  | $ 996,000 |  |  |
Derivative Asset, Notional Amount |  |  |  | 200,000,000 |  | 100,000,000 |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 967,000 |  | 996,000 |  |  |
Derivative notional amount |  |  | 100,000,000 | 200,000,000.0 |  |  | $ 100,000,000 | $ 100,000,000.0 |
Collateral posted |  |  | 0 | 0 |  |  |  |  |
Derivative Asset, Notional Amount |  |  |  | 100,000,000 |  | 100,000,000 |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  | 1,150,000,000 |  |  |  |  |  |
Income expected to be recognized in earnings in next 12 months |  |  | 3,900,000 |  |  | (800,000) |  |  |
Fair value of interest rate swap in a net liability position |  |  | 10,892,000 | 3,713,000 |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Interest Rate Swap |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Number of Instruments Held | contract |  |  |  |  |  |  |  |  | 3
Fair value of interest rate swap in a net liability position |  |  |  | 3,713,000 |  | (3,101,000) |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Interest Rate Swap Effective Date July 1, 2020, $425,000 Notional Amount |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative notional amount | $ 425,000,000 |  |  |  |  |  |  |  |
Derivative contract term | 5 years |  |  |  |  |  |  |  |
Recurring basis | Interest Rate Swap |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative Asset |  |  | 310,000 | 1,032,000 |  | 996,000 |  |  |
Recurring basis | Griffin Capital Essential Asset REIT, Inc. [Member] | Interest Rate Swap |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative Asset |  |  | 10,892,000 | 3,713,000 |  |  |  |  |
Recurring basis | Level 2 | Interest Rate Swap |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative Asset |  |  | 310,000 | 1,032,000 |  | 996,000 |  |  |
Recurring basis | Level 2 | Griffin Capital Essential Asset REIT, Inc. [Member] | Interest Rate Swap |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative Asset |  |  | 10,892,000 | 3,713,000 |  |  |  |  |
Griffin Capital Essential Asset Operating Partnership, L.P. [Member] | Interest Rate Swap |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative Asset |  |  | $ 0 | 65,000 |  | 0 |  |  |
Derivative Asset, Notional Amount |  |  |  | $ 100,000,000 |  | $ 0 |  |  |
Griffin Capital Essential Asset Operating Partnership, L.P. [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] | Interest Rate Swap |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  | $ 100,000,000 |  |  |  |
Griffin Capital Essential Asset Operating Partnership, L.P. [Member] | Recurring basis | Level 2 | Interest Rate Swap |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Fair value of interest rate swap in a net liability position |  |  |  |  | 9,000 |  |  |  |
Derivative Asset, Notional Amount |  |  |  |  | $ 100,000,000 |  |  |  |
Cash Flow Hedging | Swap [Member] |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative notional amount |  | $ 100,000,000 |  |  |  |  |  |  |
Proceeds from Derivative Instrument, Investing Activities |  | $ 100,000 |  |  |  |  |  |  |

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