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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 24 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 07, 2018 | Nov. 02, 2018 | Oct. 31, 2018 | Oct. 03, 2018 | Sep. 12, 2018 | Mar. 08, 2018 | Feb. 16, 2018 | Jan. 31, 2018 | Nov. 07, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Mar. 07, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Oct. 24, 2018
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued pursuant to the distribution reinvestment plan |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |
Stock redeemed during period (in shares) |  |  |  |  |  |  |  |  |  |  |  | 2,791,262 |  |  | 790,941 |  |  |  |
Value of shares redeemed |  |  |  |  |  |  |  |  |  |  |  | $ 5,292 |  |  |  |  |  |  |
Dividends per share declared (in usd per share) |  |  |  |  | $ 0.0015068493 |  |  |  |  | $ 0.14 | $ 0.14 | $ 0.42 |  | $ 0.42 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per share declared (in usd per share) |  |  |  |  |  | $ 0.00150684932 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Distribution Reinvestment Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Dividend Reinvestment Plan | 7,372,224 |  |  |  |  |  |  |  |  |  |  |  | 4,818,911 |  |  |  |  |  |
Common stock issued pursuant to the distribution reinvestment plan | $ 70,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan |  |  |  |  |  |  |  |  |  |  |  |  | $ 45,600 |  |  |  |  |  |
Subsequent Event | Follow-on Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Dividend Reinvestment Plan |  |  |  |  |  |  |  |  |  |  |  |  | 299,515 |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,800 |  |  |  |  |  |
Share Redemption Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock redeemed during period (in shares) |  |  |  |  |  |  |  | 217,088 |  |  |  |  |  |  |  |  |  |  |
Value of shares redeemed |  |  |  | $ 6,700 |  |  |  | $ 2,000 |  |  |  |  |  |  |  |  |  |  |
Stock Redeemed or Called During Period, Weighted Average Price per Share |  |  |  | $ 9.62 |  |  |  | $ 9.09 |  |  |  |  |  |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued pursuant to the distribution reinvestment plan |  |  |  |  |  |  |  |  |  |  |  | $ 33,667 |  | $ 37,438 | $ 49,541 | $ 52,174 | $ 52,557 |  |
Dividends per share declared (in usd per share) |  |  |  |  | $ 0.001901096 |  |  |  |  | $ 0.17 | $ 0.17 | $ 0.51 |  | $ 0.51 |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Dividend Reinvestment Plan |  |  |  |  |  |  |  |  |  |  |  |  | 19,135,619 |  |  |  |  |  |
Estimated net asset value per share (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.05
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan |  |  |  |  |  |  |  |  |  |  |  |  | $ 196,500 |  |  |  |  |  |
Dividends per share declared (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.001901096 |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Subsequent Event | Distribution Reinvestment Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  |  |  |  |  |  |  | 22,100,900 |  |  |  |  |  |  |  |  |  |
Common stock issued pursuant to the distribution reinvestment plan |  |  |  |  |  |  |  |  | $ 226,300 |  |  |  |  |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Share Redemption Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [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 |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Share Redemption Program | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock redeemed during period (in shares) |  |  | 681,757 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares redeemed |  |  | $ 6,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average price per share (in dollars per share) |  |  | $ 9.76 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Quad Graphics Property | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property |  | $ 10,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from termination fees, net closing costs and credits |  | 3,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of property sold |  | $ 9,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advisor and Property Manager Fees - Performance Distribution [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance Distribution, Percentage Of Total Return |  |  |  |  |  |  |  |  |  |  |  | 12.50% |  |  | 12.50% |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  | $ 1,200 |  |  |  |  |  |  |  |  |  |  |  |
Advisor and Property Manager Fees - Performance Distribution [Member] | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  | 1,200 |  |  |  |  |  |  |  |  |  |  |  |
Limited Partnership Units [Member] | Advisor and Property Manager Fees - Performance Distribution [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  | 1,200 |  |  |  |  |  |  |  |  |  |  |  |
Limited Partnership Units [Member] | Advisor and Property Manager Fees - Performance Distribution [Member] | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  | $ 1,200 |  |  |  |  |  |  |  |  |  |  |  |

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