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Interest Rate Contracts - Summary of Interest Rate Swaps (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017 | Nov. 01, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Apr. 01, 2016 | Feb. 25, 2016
--- | --- | --- | --- | --- | --- | --- | ---
Derivative [Line Items] |  |  |  |  |  |  |
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 notional amount | 100,000,000 | 200,000,000.0 |  |  |  | $ 100,000,000 | $ 100,000,000.0
Derivative Asset |  | 967,000 |  |  | 996,000 |  |
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 |  |  |  |  |  |
Fair value of interest rate swap in a net asset (liability) position | 10,892,000 | 3,713,000 |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Interest Rate Swap Effective Date July 9, 2015 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative notional amount | $ 425,000,000 |  |  |  |  |  |
Interest Strike Rate | 1.69% |  |  | 1.69% |  |  |
Fair value of interest rate swap in a net asset (liability) position | $ 8,016,000 | 3,255,000 |  |  | (1,630,000) |  |
Derivative Liability, Notional Amount |  | 425,000 |  |  | 425,000 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Interest Rate Swap Effective Date January 1, 2016 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative notional amount | $ 300,000,000 |  |  |  |  |  |
Interest Strike Rate | 1.32% |  |  | 1.32% |  |  |
Fair value of interest rate swap in a net asset (liability) position | $ 0 | 458,000 |  |  | (907,000) |  |
Derivative Liability, Notional Amount |  | 300,000 |  |  | 300,000 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Interest Rate Swap Effective Date July 1, 2020 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative notional amount | $ 125,000,000 |  |  |  |  |  |
Interest Strike Rate | 2.82% |  |  |  |  |  |
Fair value of interest rate swap in a net asset (liability) position | $ 903,000 | 0 |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Interest Rate Swap Effective Date July 1, 2020 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative notional amount | $ 100,000,000 |  |  |  |  |  |
Interest Strike Rate | 2.82% |  |  |  |  |  |
Fair value of interest rate swap in a net asset (liability) position | $ 697,000 | 0 |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Interest Rate Swap Effective Date July 1, 2020 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative notional amount | $ 100,000,000 |  |  |  |  |  |
Interest Strike Rate | 2.83% |  |  |  |  |  |
Fair value of interest rate swap in a net asset (liability) position | $ 677,000 | 0 |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Interest Rate Swap Effective Date July 1, 2020 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative notional amount | $ 100,000,000 |  |  |  |  |  |
Interest Strike Rate | 2.84% |  |  |  |  |  |
Fair value of interest rate swap in a net asset (liability) position | $ 599,000 | 0 |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Interest Rate Swap Effective Date July, 1 2016 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Interest Strike Rate |  |  |  | 1.50% |  |  |
Fair value of interest rate swap in a net asset (liability) position |  | 0 |  |  | (564,000) |  |
Derivative Liability, Notional Amount |  | 0 |  |  | 100,000 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Interest Rate Swap |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Fair value of interest rate swap in a net asset (liability) position |  | 3,713,000 |  |  | (3,101,000) |  |
Derivative Liability, Notional Amount |  | 725,000 |  |  | 825,000 |  |
Sponsor [Member] | Interest Rate Swap |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Asset | 310,000 | 967,000 |  |  |  |  |
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 |  |  |  |
Level 2 | Interest Rate Swap |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Interest Strike Rate | 0.74% | 0.74% |  |  |  |  |
Level 2 | Griffin Capital Essential Asset Operating Partnership, L.P. [Member] | Interest Rate Swap |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Interest Strike Rate | 1.50% | 1.50% |  |  |  |  |
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 |  |  |  |  |
Recurring basis | Level 2 | Griffin Capital Essential Asset Operating Partnership, L.P. [Member] | Interest Rate Swap |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Fair value of interest rate swap in a net asset (liability) position |  |  | 9,000 |  |  |  |
Derivative Asset, Notional Amount |  |  | $ 100,000,000 |  |  |  |

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