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Equity - Narrative (Details) |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 24 Months Ended | 57 Months Ended | 67 Months Ended | 72 Months Ended |  |  |  |  |
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Jun. 14, 2017 $ / shares shares | Apr. 06, 2017 shares | Jun. 12, 2014 $ / shares | Mar. 03, 2014 shares | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) shares | Sep. 30, 2017 $ / shares shares | Mar. 31, 2017 shares | Sep. 30, 2018 USD ($) vote $ / shares shares | Sep. 30, 2017 $ / shares shares | Dec. 31, 2017 USD ($) vote redemption $ / shares shares | Dec. 31, 2016 USD ($) redemption $ / shares shares | Dec. 31, 2017 USD ($) redemption $ / shares shares | Dec. 31, 2017 USD ($) redemption $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) | Jul. 05, 2018 | Sep. 20, 2017 USD ($) | Jun. 09, 2017 USD ($) | Sep. 22, 2015 USD ($) | Jul. 31, 2014 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares to be registered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,200,000,000.0
Percentage of Organizational and Offering Costs Limit |  |  |  |  |  |  |  |  | 15.00% |  | 15.00% |  |  |  |  |  |  |  |  |  |
Common Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares outstanding (in shares) | shares |  |  |  |  | 77,660,266 | 77,660,266 |  |  | 77,660,266 |  | 77,175,283 | 70,939,647 | 77,175,283 | 77,175,283 | 77,660,266 |  |  |  |  |  |
Value of shares redeemed |  |  |  |  |  |  |  |  | $ 5,292,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock redeemed during period (in shares) | shares |  |  |  |  |  |  |  |  | 2,791,262 |  | 790,941 |  |  |  |  |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  | 10,000,000 | 10,000,000 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares |  |  |  |  |  |  |  |  |  |  | 7,717,528 |  | 7,717,528 | 7,717,528 |  |  |  |  |  |  |
Days Required for Reimburse Excess Amounts |  |  |  |  |  |  |  |  | 60 days |  | 60 days |  |  |  |  |  |  |  |  |  |
Organizational Costs As A Percentage Of Gross Offering Proceeds |  |  |  |  |  |  |  |  | 33.30% |  | 81.00% |  |  |  |  |  |  |  |  |  |
Distributions Reinvestment Plan, Amendment or Termination, Written Notice Required |  |  |  |  |  |  |  |  | 10 days |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests |  |  |  |  | $ 37,401,000 | $ 37,401,000 |  |  | $ 37,401,000 |  | $ 32,405,000 | $ 16,930,000 | $ 32,405,000 | $ 32,405,000 | $ 37,401,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Number of Votes Entitled per_Share | vote |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |  |  |  |  |  |  |  |
Due to affiliates |  |  |  |  | $ 18,988,000 | $ 18,988,000 |  |  | $ 18,988,000 |  | $ 16,896,000 | $ 22,481,000 | $ 16,896,000 | $ 16,896,000 | $ 18,988,000 |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Common Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares outstanding (in shares) | shares |  |  |  |  | 166,253,534 | 166,253,534 |  |  | 166,253,534 |  | 170,906,111 | 176,032,871 | 170,906,111 | 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 | $ 20,382,000 | $ 6,653,000 |  |  |  |  |  |
Share redemption requests in excess of annual limitation |  |  |  |  | $ 32,400,000 | $ 32,400,000 |  |  | $ 32,400,000 |  |  |  |  |  | $ 32,400,000 |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of noncontrolling interests based on total shares (percent) |  |  |  |  | 3.62% | 3.62% |  |  | 3.62% |  | 4.00% |  | 4.00% | 4.00% | 3.62% |  |  |  |  |  |
Percentage of noncontrolling interests based on weighted average shares outstanding (percent) |  |  |  |  | 3.58% | 3.58% |  |  | 3.58% |  |  |  |  |  | 3.58% |  |  |  |  |  |
Partnership unit exchange (in shares) | shares |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |  |  |  |  |  |  |  |
Number of limited partnership units related to redemption requests (in shares) | shares |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Limited Partners' Capital Account, Units Issued in Exchange for Property | shares |  |  |  |  |  |  |  |  |  |  | 6,600,000 |  |  |  |  |  |  |  |  |  |
Limited Partners' Capital Account, Units Issued | shares |  |  |  |  |  |  |  |  |  |  | 100,000 |  | 100,000 | 100,000 |  |  |  |  |  |  |
Number of Redemption Requests | redemption |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  | 10,000,000 | 10,000,000 |  |  |  |  |  |  |
Due to affiliates |  |  |  |  | $ 4,018,000 | $ 4,018,000 |  |  | $ 4,018,000 |  | $ 3,535,000 | $ 2,719,000 | $ 3,535,000 | $ 3,535,000 | $ 4,018,000 |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Partnership issued in exchange for certain properties |  |  |  |  |  |  |  |  | 6,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Unaffiliated Entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Partnership issued in exchange for certain properties |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Subject to Mandatory Redemption [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  | 32,400,000 |  | 32,400,000 | 32,400,000 |  |  |  |  |  |  |
Share Redemption Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares redeemed |  |  |  |  |  |  |  |  | $ 12,200,000 |  | $ 5,700,000 | $ 1,600,000 | $ 7,400,000 |  |  |  |  |  |  |  |
Stock Redeemed or Called During Period, Weighted Average Price per Share | $ / shares |  |  |  |  | $ 9.65 |  | $ 9.06 |  | $ 9.36 | $ 9.18 | $ 9.21 | $ 9.72 | $ 9.32 |  |  |  |  |  |  |  |
Minimum holding period for stock to be redeemed from stockholder by the Company |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |
Minimum Redemption Percentage |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |
Maximum redemption percentage of weighted average shares outstanding |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |
Minimum ownership balance (shares) |  |  |  |  |  |  |  |  |  |  | $ 2,500 |  | $ 2,500 | $ 2,500 |  |  |  |  |  |  |
Percentage of Net Asset Value of shares (percent) |  |  |  |  |  |  |  |  |  |  | 100.00% |  | 100.00% | 100.00% |  |  |  |  |  |  |
Stock redeemed during period (in shares) | shares |  |  |  |  | 585,525 |  | 146,083 |  | 1,306,834 | 413,842 | 623,499 | 167,442 | 790,941 |  |  |  |  |  |  |  |
Share Redemption Program | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for written notice |  |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |
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 | $ 20,400,000 | 6,700,000 |  |  |  |  |  |
Maximum redemption percentage of weighted average shares outstanding |  |  |  |  |  |  |  |  | 5.00% |  | 5.00% |  |  |  |  |  |  |  |  |  |
Minimum ownership balance (shares) |  |  |  |  | $ 2,500 | $ 2,500 |  |  | $ 2,500 |  | $ 2,500 |  | $ 2,500 | $ 2,500 | $ 2,500 |  |  |  |  |  |
Percentage of Net Asset Value of shares (percent) |  |  |  |  | 95.00% | 95.00% |  |  | 95.00% |  | 95.00% |  | 95.00% | 95.00% | 95.00% |  |  |  |  |  |
Repurchase percentage of Net Asset Value of shares (percent) |  |  |  |  | 100.00% | 100.00% |  |  | 100.00% |  | 100.00% |  | 100.00% | 100.00% | 100.00% |  |  |  |  |  |
Stock redeemed during period (in shares) | shares |  |  |  |  | 1,311,582 |  | 2,936,150 |  | 8,013,521 | 6,155,290 | 9,931,245 | 4,164,955 |  |  |  |  |  |  |  |  |
Weighted average price per share (in dollars per share) | $ / shares |  |  |  |  | $ 9.63 |  | $ 9.97 |  | $ 9.60 | $ 9.98 | $ 9.96 | $ 9.95 |  |  |  |  |  |  |  |  |
Share Redemption Program | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,600,000 |  |  |  |  |  |
Stock redeemed during period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,097,775 |  |  |  |  |  |
Weighted average price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.34 |  |  |  |  |  |
Share Redemption Program | Common Stock | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares redeemed |  |  |  |  |  |  |  |  | $ 234,600,000 |  | $ 157,700,000 | $ 58,800,000 |  | $ 157,700,000 | $ 234,600,000 |  |  |  |  |  |
Redemptions payable |  |  |  |  | $ 6,700,000 | $ 6,700,000 |  |  | $ 6,700,000 |  |  |  |  |  | $ 6,700,000 |  |  |  |  |  |
Minimum holding period for stock to be redeemed from stockholder by the Company |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Maximum redemption percentage of weighted average shares outstanding |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |
Redemption requests received (shares) | shares |  |  |  |  | 4,083,881 |  | 3,878,396 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share redemption requests in excess of annual limit (shares) | shares |  |  |  |  | 3,401,249 |  | 104,999 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of shares requested that were redeemed (percent) |  |  |  |  | 16.70% |  | 97.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock redeemed during period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,849,898 | 23,863,419 |  |  |  |  |  |
Weighted average price per share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 9.92 |  |  |  |  |  |  | $ 9.95 | $ 9.83 |  |  |  |  |  |
Share Repurchase Program, Redemption Requests Satisfied, Percent |  |  |  |  |  |  | 95.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Subject to Redemption |  |  |  |  |  |  |  |  |  |  | $ 20,400,000 | 11,600,000 | $ 20,400,000 | $ 20,400,000 |  |  |  |  |  |  |
New Share Redemption Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,700,000 |  |  |  |  |  |
Stock Redeemed or Called During Period, Weighted Average Price per Share | $ / shares |  |  |  |  | $ 9.62 |  | $ 0.00 |  | $ 9.62 | $ 0.00 |  |  |  |  |  |  |  |  |  |  |
Minimum holding period for stock to be redeemed from stockholder by the Company |  |  |  |  |  |  |  |  | 1 year |  | 1 year |  |  |  |  |  |  |  |  |  |
Minimum ownership balance (shares) |  |  |  |  | $ 2,500 | $ 2,500 |  |  | $ 2,500 |  |  |  |  |  | $ 2,500 |  |  |  |  |  |
Percentage of Net Asset Value of shares (percent) |  |  |  |  | 100.00% | 100.00% |  |  | 100.00% |  |  |  |  |  | 100.00% |  | 100.00% |  |  |  |
Stock redeemed during period (in shares) | shares |  |  |  |  | 693,487 | 693,487 | 0 |  | 693,487 | 0 |  |  |  |  |  |  |  |  |  |  |
Weighted average price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.62 |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests |  |  |  |  | $ 37,400,000 | $ 37,400,000 |  |  | $ 37,400,000 |  |  |  |  |  | $ 37,400,000 |  |  |  |  |  |
Share Redemption Program, Quarterly Cap, Percentage of Net Asset Value of Outstanding Shares |  |  |  |  |  |  |  |  | 5.00% |  | 5.00% |  |  |  |  |  |  |  |  |  |
Share Redemption Program, Quarterly Cap |  |  |  |  |  |  |  |  |  |  | $ 0 |  | 0 | 0 |  |  |  |  |  |  |
Follow-on Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares to be registered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,200,000,000.0 |  |  |
Primary Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares to be registered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000,000.0 |  |  |
Private Placement | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of private placement |  |  |  |  |  |  |  |  | $ 1,500,000,000 |  | $ 1,500,000,000 |  |  |  |  | $ 1,300,000,000 |  |  |  |  |
IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares to be registered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000,000
IPO [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for written notice |  |  |  |  |  |  |  |  | 10 days |  | 10 days |  |  |  |  |  |  |  |  |  |
IPO [Member] | Share Redemption Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum holding period for stock to be redeemed from stockholder by the Company |  |  |  |  |  |  |  |  | 4 years |  | 4 years |  |  |  |  |  |  |  |  |  |
IPO [Member] | New Share Redemption Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum holding period for stock to be redeemed from stockholder by the Company |  |  |  |  |  |  |  |  | 4 years |  | 4 years |  |  |  |  |  |  |  |  |  |
Distribution Reinvestment Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Offering, Registration Statement, Shares | shares |  | 3,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity offering, termination notice period |  | 10 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares to be registered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000.0 |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Tendered For Redemption, Value |  |  |  |  | 6,700,000 | 6,700,000 |  |  | $ 6,700,000 |  | $ 2,200,000 |  | 2,200,000 | 2,200,000 | 6,700,000 |  |  |  |  |  |
Common Stock Approved under Common Stock Distribution Reinvestment Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000.0 |  |  | $ 200,000,000
Distribution Reinvestment Plan | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity offering, termination notice period |  |  |  |  |  |  |  |  | 10 days |  | 10 days |  |  |  |  |  |  |  |  |  |
Value of shares to be registered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 | $ 100,000,000 |
Common Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  | 245,600,000 | 245,600,000 |  |  | $ 245,600,000 |  | $ 211,900,000 | $ 162,400,000 | 211,900,000 | 211,900,000 | 245,600,000 |  |  |  |  |  |
Maximum | Share Redemption Program | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption Percentage Weighted Average Shares Outstanding |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |
Restricted Stock [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  |  | $ 10.28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 10.40 |  |  |  |  |  |  |  |  |
Director [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares | 7,000 |  |  |  |  |  |  | 15,000 |  |  | 36,000 |  |  |  |  |  |  |  |  |  |
Director [Member] | Restricted Stock [Member] | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares | 7,000 |  |  | 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | shares |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares | $ 10.44 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | shares |  |  |  |  |  |  |  |  |  |  | 13,000 |  |  |  |  |  |  |  |  |  |
Contingent Advisor Payment Holdback - Organization and Offering Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due from Related Parties |  |  |  |  |  |  |  |  |  |  | $ 100,000 | $ 5,400,000 | 100,000 | 100,000 |  |  |  |  |  |  |
Cumulative Organizational Costs Private and Public Offerings |  |  |  |  | 510,000 | 510,000 |  |  | 510,000 |  | 359,000 |  | 359,000 | 359,000 | 510,000 |  |  |  |  |  |
Due to affiliates |  |  |  |  | 1,305,000 | 1,305,000 |  |  | 1,305,000 |  | 192,000 | $ 0 | 192,000 | 192,000 | 1,305,000 |  |  |  |  |  |
Organizational and Offering Costs Incurred [Member] | IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due from Related Parties |  |  |  |  |  |  |  |  |  |  | 76,000,000 |  | 76,000,000 | 76,000,000 |  |  |  |  |  |  |
Cumulative Organizational Costs Private and Public Offerings |  |  |  |  | 3,300,000 | 3,300,000 |  |  | 3,300,000 |  |  |  |  |  | 3,300,000 |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma [Member] | Contingent Advisor Payment Holdback - Organization and Offering Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due from Related Parties |  |  |  |  | 1,800,000 | 1,800,000 |  |  | 1,800,000 |  | 1,700,000 |  | 1,700,000 | 1,700,000 | 1,800,000 |  |  |  |  |  |
Due to affiliates |  |  |  |  | 1,500,000 | 1,500,000 |  |  | 1,500,000 |  |  |  |  |  | 1,500,000 |  |  |  |  |  |
Due to Affiliates [Member] | Contingent Advisor Payment Holdback - Organization and Offering Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due from Related Parties |  |  |  |  | 700,000 | 700,000 |  |  | 700,000 |  | 1,000,000 |  | 1,000,000 | 1,000,000 | 700,000 |  |  |  |  |  |
Other Assets [Member] | Contingent Advisor Payment Holdback - Organization and Offering Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due from Related Parties |  |  |  |  | $ 1,100,000 | $ 1,100,000 |  |  | $ 1,100,000 |  | $ 700,000 |  | $ 700,000 | $ 700,000 | $ 1,100,000 |  |  |  |  |  |

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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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