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Organization - Narrative (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 24 Months Ended | 67 Months Ended | 72 Months Ended |  |  |  |  |  |  |
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May 02, 2018 | Sep. 20, 2017 USD ($) stock_class shares | Apr. 06, 2017 shares | Jun. 30, 2015 shares | Sep. 30, 2018 USD ($) property shares | Sep. 30, 2018 USD ($) property shares | Sep. 30, 2017 shares | Sep. 30, 2018 USD ($) property shares | Sep. 30, 2017 shares | Dec. 31, 2017 USD ($) property $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) property $ / shares shares | Sep. 30, 2018 USD ($) property shares | Dec. 31, 2014 USD ($) offering shares | Jul. 05, 2018 | Jun. 09, 2017 USD ($) | Sep. 22, 2015 USD ($) | Jul. 31, 2014 USD ($) | May 07, 2014 USD ($) | Feb. 11, 2014 USD ($) | Aug. 29, 2008 USD ($)
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares to be registered | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,200,000,000.0 |  |  |
Number of shares outstanding (in shares) |  |  |  |  | 77,660,266 | 77,660,266 |  | 77,660,266 |  | 77,175,283 | 70,939,647 | 77,175,283 | 77,660,266 |  |  |  |  |  |  |  |
Value of shares redeemed | $ |  |  |  |  |  |  |  | $ 5,292,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock redeemed during period (in shares) |  |  |  |  |  |  |  | 2,791,262 |  | 790,941 |  |  |  |  |  |  |  |  |  |  |
Limited liability partnership percentage of interest held (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.00% |
Limited partnership, purchase price | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000.0 |
Initial capital contribution | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |
General partner percentage interest obtained (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |
Shares Authorized, Common and Preferred Stock |  |  |  |  |  |  |  |  |  | 1,000,000,000 |  | 1,000,000,000 |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  |  | 800,000,000 | 700,000,000 | 800,000,000 |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  |  |  |  |  |  | 200,000,000 |  | 200,000,000 |  |  |  |  |  |  |  |  |
Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate number of shares to be purchased under transaction agreement (shares) |  | 263,992 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Other Revenues from Transactions with Related Party | $ |  | $ 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Share Redemption Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares redeemed | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,700,000 |  |  |  |  |  |  |  |
Stock redeemed during period (in shares) |  |  |  |  | 693,487 | 693,487 | 0 | 693,487 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Minimum holding period for stock to be redeemed from stockholder by the Company |  |  |  |  |  |  |  | 1 year |  | 1 year |  |  |  |  |  |  |  |  |  |  |
Percentage of Net Asset Value of shares (percent) |  |  |  |  | 100.00% | 100.00% |  | 100.00% |  |  |  |  | 100.00% |  | 100.00% |  |  |  |  |  |
IPO Share Redemption Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum holding period for stock to be redeemed from stockholder by the Company | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Net Asset Value of shares (percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Redemption Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares redeemed | $ |  |  |  |  |  |  |  | $ 12,200,000 |  | $ 5,700,000 | $ 1,600,000 | $ 7,400,000 |  |  |  |  |  |  |  |  |
Stock redeemed during period (in shares) |  |  |  |  | 585,525 |  | 146,083 | 1,306,834 | 413,842 | 623,499 | 167,442 | 790,941 |  |  |  |  |  |  |  |  |
Minimum holding period for stock to be redeemed from stockholder by the Company |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |
Percentage of Net Asset Value of shares (percent) |  |  |  |  |  |  |  |  |  | 100.00% |  | 100.00% |  |  |  |  |  |  |  |  |
Common Class T [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares outstanding (in shares) |  |  |  |  | 226,297 | 226,297 |  | 226,297 |  | 4,148 | 0 | 4,148 | 226,297 |  |  |  |  |  |  |  |
Stock redeemed during period (in shares) |  |  |  |  |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  |  | 150,000,000 |  | 150,000,000 |  |  |  |  |  |  |  |  |
Common Class S [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares outstanding (in shares) |  |  |  |  | 277 | 277 |  | 277 |  | 268 | 0 | 268 | 277 |  |  |  |  |  |  |  |
Stock redeemed during period (in shares) |  |  |  |  |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  |  | 150,000,000 |  | 150,000,000 |  |  |  |  |  |  |  |  |
Common Class D [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares outstanding (in shares) |  |  |  |  | 19,157 | 19,157 |  | 19,157 |  | 268 | 0 | 268 | 19,157 |  |  |  |  |  |  |  |
Stock redeemed during period (in shares) |  |  |  |  |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  |  | 150,000,000 |  | 150,000,000 |  |  |  |  |  |  |  |  |
Common Class I [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares outstanding (in shares) |  |  |  |  | 803,069 | 803,069 |  | 803,069 |  | 267,476 | 0 | 267,476 | 803,069 |  |  |  |  |  |  |  |
Stock redeemed during period (in shares) |  |  |  |  |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  |  | 150,000,000 |  | 150,000,000 |  |  |  |  |  |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares outstanding (in shares) |  |  |  |  | 25,781,325 | 25,781,325 |  | 25,781,325 |  | 25,995,943 | 25,562,982 | 25,995,943 | 25,781,325 |  |  |  |  |  |  |  |
Stock redeemed during period (in shares) |  |  |  |  |  |  |  | 1,351,178 |  | 557,206 |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  |  | 70,000,000 |  | 70,000,000 |  |  |  |  |  |  |  |  |
Common Class AA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares outstanding (in shares) |  |  |  |  | 49,840,818 | 49,840,818 |  | 49,840,818 |  | 49,942,471 | 44,595,631 | 49,942,471 | 49,840,818 |  |  |  |  |  |  |  |
Stock redeemed during period (in shares) |  |  |  |  |  |  |  | 1,434,491 |  | 233,735 |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  |  | 120,000,000 |  | 120,000,000 |  |  |  |  |  |  |  |  |
Common Class AAA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares outstanding (in shares) |  |  |  |  | 989,323 | 989,323 |  | 989,323 |  | 964,709 | 781,034 | 964,709 | 989,323 |  |  |  |  |  |  |  |
Stock redeemed during period (in shares) |  |  |  |  |  |  |  | 5,593 |  | 0 |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  |  | 10,000,000 |  | 10,000,000 |  |  |  |  |  |  |  |  |
Sale to Public |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares to be registered | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000,000 |  |  |
Common stock issued (shares) |  |  |  |  | 73,694,264 | 73,694,264 |  | 73,694,264 |  | 72,931,727 |  | 72,931,727 | 73,694,264 |  |  |  |  |  |  |  |
Sale to Public | New Share Redemption Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum holding period for stock to be redeemed from stockholder by the Company |  |  |  |  |  |  |  | 4 years |  | 4 years |  |  |  |  |  |  |  |  |  |  |
Sale to Public | Share Redemption Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum holding period for stock to be redeemed from stockholder by the Company |  |  |  |  |  |  |  | 4 years |  | 4 years |  |  |  |  |  |  |  |  |  |  |
Sale to Public | Common Class T [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (shares) |  |  |  |  | 224,647 | 224,647 |  | 224,647 |  | 4,144 |  | 4,144 | 224,647 |  |  |  |  |  |  |  |
Sale to Public | Common Class S [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (shares) |  |  |  |  | 264 | 264 |  | 264 |  | 264 |  | 264 | 264 |  |  |  |  |  |  |  |
Sale to Public | Common Class D [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (shares) |  |  |  |  | 18,921 | 18,921 |  | 18,921 |  | 264 |  | 264 | 18,921 |  |  |  |  |  |  |  |
Sale to Public | Common Class I [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (shares) |  |  |  |  | 786,573 | 786,573 |  | 786,573 |  | 263,200 |  | 263,200 | 786,573 |  |  |  |  |  |  |  |
Sale to Public | Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (shares) |  |  |  |  | 24,199,764 | 24,199,764 |  | 24,199,764 |  | 24,199,760 |  | 24,199,760 | 24,199,764 |  |  |  |  |  |  |  |
Sale to Public | Common Class AA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (shares) |  |  |  |  | 47,562,870 | 47,562,870 |  | 47,562,870 |  | 47,562,870 |  | 47,562,870 | 47,562,870 |  |  |  |  |  |  |  |
Sale to Public | Common Class AAA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (shares) |  |  |  |  | 901,225 | 901,225 |  | 901,225 |  | 901,225 |  | 901,225 | 901,225 |  |  |  |  |  |  |  |
Distribution Reinvestment Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares to be registered | $ |  | 200,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity offering, termination notice period |  |  | 10 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (shares) |  |  |  |  | 6,152,779 | 6,152,779 |  | 6,152,779 |  | 4,440,514 |  | 4,440,514 | 6,152,779 |  |  |  |  |  |  |  |
Common Stock Approved under Common Stock Distribution Reinvestment Plan | $ |  | 200,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |
Common Stock Offering, Registration Statement, Shares |  |  | 3,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Reinvestment Plan | Common Class T [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (shares) |  |  |  |  | 1,650 | 1,650 |  | 1,650 |  | 4 |  | 4 | 1,650 |  |  |  |  |  |  |  |
Distribution Reinvestment Plan | Common Class S [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (shares) |  |  |  |  | 13 | 13 |  | 13 |  | 4 |  | 4 | 13 |  |  |  |  |  |  |  |
Distribution Reinvestment Plan | Common Class D [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (shares) |  |  |  |  | 236 | 236 |  | 236 |  | 4 |  | 4 | 236 |  |  |  |  |  |  |  |
Distribution Reinvestment Plan | Common Class I [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (shares) |  |  |  |  | 16,496 | 16,496 |  | 16,496 |  | 4,276 |  | 4,276 | 16,496 |  |  |  |  |  |  |  |
Distribution Reinvestment Plan | Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (shares) |  |  |  |  | 2,669,097 | 2,669,097 |  | 2,669,097 |  | 2,089,748 |  | 2,089,748 | 2,669,097 |  |  |  |  |  |  |  |
Distribution Reinvestment Plan | Common Class AA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (shares) |  |  |  |  | 3,412,273 | 3,412,273 |  | 3,412,273 |  | 2,313,170 |  | 2,313,170 | 3,412,273 |  |  |  |  |  |  |  |
Distribution Reinvestment Plan | Common Class AAA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (shares) |  |  |  |  | 53,014 | 53,014 |  | 53,014 |  | 33,308 |  | 33,308 | 53,014 |  |  |  |  |  |  |  |
Follow-on Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares to be registered | $ |  | $ 2,200,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of New Classes of Common Stock | stock_class |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Primary Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares to be registered | $ |  | $ 2,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreement term |  |  |  |  |  |  |  | 1 year |  | 1 year |  |  |  |  |  |  |  |  |  |  |
Renewal period term |  |  |  |  |  |  |  | 1 year |  | 1 year |  |  |  |  |  |  |  |  |  |  |
Number of public offerings | offering |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Number of shares outstanding (in shares) |  |  |  |  | 166,253,534 | 166,253,534 |  | 166,253,534 |  | 170,906,111 | 176,032,871 | 170,906,111 | 166,253,534 |  |  |  |  |  |  |  |
Redemptions payable | $ |  |  |  |  | $ 6,653,000 | $ 6,653,000 |  | $ 6,653,000 |  | $ 20,382,000 | $ 11,565,000 | $ 20,382,000 | $ 6,653,000 |  |  |  |  |  |  |  |
Limited partnership, purchase price | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000
Initial capital contribution | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000
General partner percentage interest obtained (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00%
Limited partnership, Company's ownership interest (percent) |  |  |  |  |  |  |  | 96.00% |  | 96.00% |  |  |  |  |  |  |  |  |  |  |
Number of properties contributed | property |  |  |  |  | 5 | 5 |  | 5 |  | 5 |  | 5 | 5 |  |  |  |  |  |  |  |
Limited Partnership number of units redeemed (shares) |  |  |  |  |  |  |  | 0 |  | 0 | 0 |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  |  | 700,000,000 | 700,000,000 | 700,000,000 |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 |  |  |  |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Advisor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited liability partnership percentage of interest held (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.00%
Griffin Capital Essential Asset REIT, Inc. [Member] | Sponsor and Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited liability partnership percentage of interest held (percent) |  |  |  |  | 2.00% | 2.00% |  | 2.00% |  | 2.00% |  | 2.00% | 2.00% |  |  |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited liability partnership percentage of interest held (percent) |  |  |  |  | 2.00% | 2.00% |  | 2.00% |  | 2.00% |  | 2.00% | 2.00% |  |  |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership units owned (shares) |  |  |  |  | 2,100,000 | 2,100,000 |  | 2,100,000 |  | 2,100,000 |  | 2,100,000 | 2,100,000 |  |  |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Share Redemption Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares redeemed | $ |  |  |  |  |  |  |  | $ 76,900,000 |  | $ 98,900,000 | $ 41,400,000 |  |  |  |  |  |  |  |  |  |
Redemptions payable | $ |  |  |  |  | $ 6,700,000 | $ 6,700,000 |  | $ 6,700,000 |  | $ 20,400,000 |  | $ 20,400,000 | $ 6,700,000 |  |  |  |  |  |  |  |
Stock redeemed during period (in shares) |  |  |  |  | 1,311,582 |  | 2,936,150 | 8,013,521 | 6,155,290 | 9,931,245 | 4,164,955 |  |  |  |  |  |  |  |  |  |
Percentage of Net Asset Value of shares (percent) |  |  |  |  | 95.00% | 95.00% |  | 95.00% |  | 95.00% |  | 95.00% | 95.00% |  |  |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Sale to Public |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  |  | 41,800,000 |  |  |  |  |  |  |  |  |  | 126,592,885 |  |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Private Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of private placement | $ |  |  |  |  |  |  |  | $ 1,500,000,000 |  | $ 1,500,000,000 |  |  |  | $ 1,300,000,000 |  |  |  |  |  |  |
Common stock issued (shares) |  |  |  |  | 190,116,953 | 190,116,953 |  | 190,116,953 |  | 186,756,009 |  | 186,756,009 | 190,116,953 |  |  |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | 2014 Distribution Reinvestment Plan Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares to be registered | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75,000,000 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Distribution Reinvestment Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares to be registered | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 | $ 100,000,000 |  |  |  |
Equity offering, termination notice period |  |  |  |  |  |  |  | 10 days |  | 10 days |  |  |  |  |  |  |  |  |  |  |
Common stock issued | $ |  |  |  |  | $ 245,600,000 | $ 245,600,000 |  | $ 245,600,000 |  | $ 211,900,000 | $ 162,400,000 | $ 211,900,000 | $ 245,600,000 |  |  |  |  |  |  |  |

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