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Equity Equity - Redemption Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended | 24 Months Ended | 57 Months Ended | 67 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2017 | Sep. 30, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption Price Within One Year, Percent |  |  |  |  |  | 0.00% |  |  |  |
Stock redeemed during period (in shares) |  |  |  | 2,791,262 |  | 790,941 |  |  |  |
Value of shares redeemed |  |  |  | $ 5,292 |  |  |  |  |  |
Redemption Price Year One, Percent |  |  |  |  |  | 90.00% |  |  |  |
Redemption Price Year Two, Percent |  |  |  |  |  | 95.00% |  |  |  |
Redemption Price Year Three, Percent |  |  |  |  |  | 97.50% |  |  |  |
Redemption Price Year Four and Greater, Percent |  |  |  |  |  | 100.00% |  |  |  |
Share Redemption Program |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Minimum holding period for stock to be redeemed from stockholder by the Company |  |  |  |  |  | 1 year |  |  |  |
Stock redeemed during period (in shares) |  | 585,525 | 146,083 | 1,306,834 | 413,842 | 623,499 | 167,442 | 790,941 |  |
Value of shares redeemed |  |  |  | $ 12,200 |  | $ 5,700 | $ 1,600 | $ 7,400 |  |
Stock Redeemed or Called During Period, Weighted Average Price per Share |  | $ 9.65 | $ 9.06 | $ 9.36 | $ 9.18 | $ 9.21 | $ 9.72 | $ 9.32 |  |
Share Redemption Program | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock redeemed during period (in shares) |  | 1,311,582 | 2,936,150 | 8,013,521 | 6,155,290 | 9,931,245 | 4,164,955 |  |  |
Value of shares redeemed |  |  |  | $ 76,900 |  | $ 98,900 | $ 41,400 |  |  |
Weighted average price per share (in dollars per share) |  | $ 9.63 | $ 9.97 | $ 9.60 | $ 9.98 | $ 9.96 | $ 9.95 |  |  |
New Share Redemption Program [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Minimum holding period for stock to be redeemed from stockholder by the Company |  |  |  | 1 year |  | 1 year |  |  |  |
Stock redeemed during period (in shares) | 693,487 | 693,487 | 0 | 693,487 | 0 |  |  |  |  |
Value of shares redeemed |  |  |  |  |  |  |  |  |  | $ 6,700
Weighted average price per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 9.62
Stock Redeemed or Called During Period, Weighted Average Price per Share |  | $ 9.62 | $ 0.00 | $ 9.62 | $ 0.00 |  |  |  |  |
Share Redemption Program, Modification or Suspension, Written Notice Required |  |  |  | 30 days |  |  |  |  |  |
Common Stock | Share Redemption Program |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock redeemed during period (in shares) |  |  |  |  |  |  |  |  |  | 2,097,775
Value of shares redeemed |  |  |  |  |  |  |  |  |  | $ 19,600
Weighted average price per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 9.34
Common Stock | Share Redemption Program | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Minimum holding period for stock to be redeemed from stockholder by the Company |  |  |  | 1 year |  |  |  |  |  |
Stock redeemed during period (in shares) |  |  |  |  |  |  |  |  | 15,849,898 | 23,863,419
Value of shares redeemed |  |  |  | $ 234,600 |  | $ 157,700 | $ 58,800 |  | $ 157,700 | $ 234,600
Weighted average price per share (in dollars per share) |  |  | $ 9.92 |  |  |  |  |  | $ 9.95 | $ 9.83

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