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Organization - Narrative (Details) $ / shares in Units, $ in Billions |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 10, 2019 shares | Apr. 30, 2019 $ / shares shares | Dec. 14, 2018 shares | Sep. 20, 2017 USD ($) | Sep. 30, 2018 | Jun. 30, 2019 USD ($) $ / shares shares | Dec. 31, 2018 $ / shares shares | May 06, 2019 $ / shares | May 01, 2019 shares | Apr. 29, 2019 | Jun. 30, 2015 shares
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Exchange ratio |  | 1.04807 |  |  |  |  |  |  |  |  |
Common Stock, par value (in usd per share) | $ / shares |  |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 |  |  |
Exchange ratio |  | 1.04807 |  |  |  |  |  |  |  |  |
Number of shares outstanding (in shares) |  | 78,054,934 |  |  |  | 243,610,554 | 174,470,284 |  | 252,863,421 |  |
GCEAR's operating partnership units outstanding as of April 30, 2019 (in shares) |  | 527,045 |  |  |  |  |  |  |  |  |
Proceeds from issuance of private placement | $ |  |  |  | $ 2.2 |  |  |  |  |  |  |
Limited partnership, Company's ownership interest (percent) |  |  |  |  |  | 88.50% |  |  |  |  |
Limited partnership units redeemed (shares) |  |  |  |  |  | 0 | 0 |  |  |  |
Implied EA-1 common stock issued in consideration |  | 78,100,000 |  |  |  |  |  |  |  |  |
Sponsor and Affiliates |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Limited liability partnership percentage of interest held (percent) |  |  |  |  |  | 10.00% |  |  |  |  |
Third parties |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Limited liability partnership percentage of interest held (percent) |  |  |  |  |  | 1.50% |  |  |  |  |
Board Chairman |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Partnership units owned (shares) |  |  |  |  |  | 2,400,000 |  |  |  |  |
Share Redemption Program |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum redemption percentage of weighted average shares outstanding |  |  |  |  | 5.00% |  |  |  |  |  |
Common Class E |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Exchange ratio |  | 1.04807 |  |  |  |  |  |  |  | 1.04807 |
Common Stock, par value (in usd per share) | $ / shares |  | $ 0.001 |  |  |  |  |  |  |  |  |
Exchange ratio |  | 1.04807 |  |  |  |  |  |  |  |  |
Partnership units issued (shares) |  | 1 |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 7,217,570 | 174,981,547 |  |  |  |  |  |  |  |  |
Number of shares outstanding (in shares) |  |  |  |  |  | 168,473,558 |  |  |  |  |
Series A Cumulative Perpetual Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued upon conversion (shares) |  | 1 |  |  |  |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  | 5,000,000 |  |  |  |  |  |  |  |  |
Number of shares outstanding (in shares) |  | 5,000,000 |  |  |  |  |  |  |  |  |
Private Offering |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of private placement | $ |  |  |  | 2.0 |  | $ 2.7 |  |  |  |  |
Implied EA-1 common stock issued in consideration |  |  |  |  |  | 277,814,656 |  |  |  |  |
Distribution Reinvestment Plan |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of private placement | $ |  |  |  | $ 0.2 |  |  |  |  |  |  |
Implied EA-1 common stock issued in consideration |  |  |  |  |  | 268,100,000 | 252,800,000 |  |  |  |
Temporary Equity, Shares Outstanding |  |  |  |  |  | 77,691,333 |  |  |  |  |
Signature Office REIT Merger |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Implied EA-1 common stock issued in consideration |  |  |  |  |  |  |  |  |  |  | 43,772,611
OP Units |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
GCEAR's operating partnership units outstanding as of April 30, 2019 (in shares) |  | 284,533,435 |  |  |  |  |  |  |  |  |
GRECO |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Units of limited partnership exchanged as earn-out consideration (in shares) |  |  | 20,438,684 |  |  |  |  |  |  |  |

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