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Declaration of Distributions (Details) - $ / shares |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Sep. 12, 2018 | Mar. 08, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Mar. 07, 2018 | Sep. 30, 2017
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividends per share paid (in usd per share) |  |  | $ 0.0015068493 | $ 0.00150684932 |  |  |  |
Dividends per share declared (in usd per share) | $ 0.0015068493 |  | 0.14 |  | $ 0.14 | $ 0.42 |  | $ 0.42
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividends per share paid (in usd per share) |  |  | 0.001901096 | $ 0.001901096 |  |  |  |
Dividends per share declared (in usd per share) | $ 0.001901096 |  | $ 0.17 |  | $ 0.17 | $ 0.51 |  | $ 0.51
Subsequent Event |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividends per share declared (in usd per share) |  | $ 0.00150684932 |  |  |  |  |  |
Subsequent Event | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividends per share declared (in usd per share) |  |  |  |  |  |  | $ 0.001901096 |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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