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Subsequent Events - Narrative (Details) $ / shares in Units, ft² in Millions |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 13, 2019 USD ($) shares | May 01, 2019 shares | Apr. 30, 2019 USD ($) ft² property state building $ / shares shares | Mar. 13, 2019 $ / shares | May 09, 2018 $ / shares | Mar. 31, 2019 USD ($) state Property building $ / shares | Mar. 31, 2018 USD ($) $ / shares | Dec. 31, 2018 USD ($) | May 06, 2019 USD ($) $ / shares | Apr. 29, 2019 shares
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Issuance of shares for distribution reinvestment plan | $ |  |  |  |  |  | $ 3,323,000 | $ 5,483,000 | $ 0 |  |
Distributions declared, daily accrual (usd per share) |  |  |  |  | $ 0.0015068493 | $ 0.14 | $ 0.14 |  |  |
Number of buildings (building) | building |  |  |  |  |  | 35 |  |  |  |
Number of properties (property) | Property |  |  |  |  |  | 27 |  |  |  |
Number of states (state) | state |  |  |  |  |  | 17 |  |  |  |
Debt finance costs paid | $ |  |  |  |  |  | $ 0 | $ 5,275,000 |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Distributions declared, daily accrual (usd per share) |  |  | $ 0.00150684932 |  |  |  |  |  |  |
Stock distribution declared (in usd per share) |  |  | $ 0.000273973 |  |  |  |  |  |  |
Partnership units issued upon conversion (shares) | shares |  |  | 1 |  |  |  |  |  |  |
Number of buildings (building) | building |  |  | 124 |  |  |  |  |  |  |
Number of properties (property) | property |  |  | 101 |  |  |  |  |  |  |
Number of states (state) | state |  |  | 25 |  |  |  |  |  |  |
Rentable area (in sq ft) | ft² |  |  | 27.2 |  |  |  |  |  |  |
Weighted average remaining lease term |  |  | 7 years 5 months 23 days |  |  |  |  |  |  |
Subsequent Event | Distribution Reinvestment Plan |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Issuance of shares for distribution reinvestment plan (shares) | shares | 7,396,052 |  |  |  |  |  |  |  |  |
Issuance of shares for distribution reinvestment plan | $ | $ 70,300,000 |  |  |  |  |  |  |  |  |
Subsequent Event | Follow-on Offering |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Issuance of shares for distribution reinvestment plan (shares) | shares | 1,030,404 |  |  |  |  |  |  |  |  |
Issuance of shares for distribution reinvestment plan | $ | $ 10,000,000 |  |  |  |  |  |  |  |  |
Subsequent Event | the Company Offer |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Common stock, par value (in USD per share) |  |  |  |  |  |  |  |  | $ 0.001 |
Self-tender offer amount | $ |  |  |  |  |  |  |  |  | $ 100,000,000 |
Griffin Capital Essential Asset REIT, Inc. | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Common stock, par value (in USD per share) |  |  | $ 0.001 |  |  |  |  |  |  |
Common Class E | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Common stock, par value (in USD per share) |  |  | $ 0.001 |  |  |  |  |  |  |
New shares issued upon conversion (shares) |  |  | 1.04807 |  |  |  |  |  |  |
New partnership units issued upon conversion (shares) |  |  | 1.04807 |  |  |  |  |  |  |
Common Class E | Subsequent Event | the Company Offer |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Cash purchase price (in usd per share) |  |  |  |  |  |  |  |  | $ 9.56 |
Series A Preferred Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Shares issued upon conversion (shares) | shares |  |  | 1 |  |  |  |  |  |  |
Preferred stock authorized (shares) | shares |  |  |  |  |  |  |  |  |  | 10,000,000
Preferred stock issued (shares) | shares |  |  | 5,000,000 |  |  |  |  |  |  |
Preferred stock annual distribution rate (percent) |  |  | 6.55% |  |  |  |  |  |  |
Class A |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Distributions declared, daily accrual (usd per share) |  |  |  | $ 0.0015068493 |  |  |  |  |  |
Class A | Subsequent Event | the Company Offer |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Cash purchase price (in usd per share) |  |  |  |  |  |  |  |  | 9.56 |
Class AA |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Distributions declared, daily accrual (usd per share) |  |  |  | 0.0015068493 |  |  |  |  |  |
Class AA | Subsequent Event | the Company Offer |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Cash purchase price (in usd per share) |  |  |  |  |  |  |  |  | 9.56 |
Class AAA |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Distributions declared, daily accrual (usd per share) |  |  |  | 0.0015068493 |  |  |  |  |  |
Class AAA | Subsequent Event | the Company Offer |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Cash purchase price (in usd per share) |  |  |  |  |  |  |  |  | 9.56 |
Class T |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Distributions declared, daily accrual (usd per share) |  |  |  | 0.00150684932 |  |  |  |  |  |
Class T | Subsequent Event | the Company Offer |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Cash purchase price (in usd per share) |  |  |  |  |  |  |  |  | 9.66 |
Class D |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Distributions declared, daily accrual (usd per share) |  |  |  | 0.0015068493 |  |  |  |  |  |
Class D | Subsequent Event | the Company Offer |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Cash purchase price (in usd per share) |  |  |  |  |  |  |  |  | 9.64 |
Class S | Subsequent Event | the Company Offer |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Cash purchase price (in usd per share) |  |  |  |  |  |  |  |  | 9.65 |
Class I |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Distributions declared, daily accrual (usd per share) |  |  |  | $ 0.0015068493 |  |  |  |  |  |
Class I | Subsequent Event | the Company Offer |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Cash purchase price (in usd per share) |  |  |  |  |  |  |  |  | $ 9.64 |
Revolving Credit Facility | 2026 Term Commitment | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Revolving credit facility current borrowing capacity | $ |  |  | $ 150,000,000 |  |  |  |  |  |  |
Revolving Credit Facility | 2024 Term Commitment | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Revolving credit facility current borrowing capacity | $ |  |  | $ 400,000,000 |  |  |  |  |  |  |
Revolving Credit Facility | 2024 Term Loan | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Initial term of debt instrument |  |  | 5 years |  |  |  |  |  |  |
Revolving Credit Facility | 2023 Term Loan | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Initial term of debt instrument |  |  | 5 years |  |  |  |  |  |  |
Revolving Credit Facility | 2023 Term Commitment | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Commitment fee (percent) |  |  | 0.25% |  |  |  |  |  |  |
Revolving credit facility current borrowing capacity | $ |  |  | $ 200,000,000 |  |  |  |  |  |  |
Revolving Credit Facility | Revolving Commitment | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Debt finance costs paid | $ |  |  | $ 5,700,000 |  |  |  |  |  |  |
Revolving credit facility, extension term |  |  | 1 year |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity | $ |  |  | $ 2,000,000,000.0 |  |  |  |  |  |  |
Minimum increment to commitment amount authorized | $ |  |  | 25,000,000 |  |  |  |  |  |  |
Authorized decrease in commitment amount | $ |  |  | 50,000,000 |  |  |  |  |  |  |
Minimum borrowing capacity | $ |  |  | 150,000,000 |  |  |  |  |  |  |
Revolving credit facility current borrowing capacity | $ |  |  | $ 750,000,000 |  |  |  |  |  |  |
Initial term of debt instrument |  |  | 3 years |  |  |  |  |  |  |
Number of pool properties called by debt covenant | property |  |  | 15 |  |  |  |  |  |  |
Maximum aggregate pool value to be contributed by single pool property or tenant (percent) |  |  | 15.00% |  |  |  |  |  |  |
Maximum aggregate pool value that may be contributed by Pool Properties subject to ground leases (percent) |  |  | 15.00% |  |  |  |  |  |  |
Maximum aggregate pool value that may be contributed by Pool Properties under development (percent) |  |  | 20.00% |  |  |  |  |  |  |
Minimum aggregate leasing percentage of all Pool Properties (percent) |  |  | 90.00% |  |  |  |  |  |  |
Asset pool leverage ratio (percent) |  |  | 60.00% |  |  |  |  |  |  |
Debt service coverage ratio |  |  | 200.00% |  |  |  |  |  |  |
Commitment fee | $ |  |  | $ 25,000 |  |  |  |  |  |  |
Percentage of commitment (percent) |  |  | 50.00% |  |  |  |  |  |  |
Consolidated leverage ratio |  |  | 60.00% |  |  |  |  |  |  |
Consolidated tangible net worth (percent) |  |  | 75.00% |  |  |  |  |  |  |
Consolidated tangible net worth | $ |  |  | $ 2,000,000,000 |  |  |  |  |  |  |
Consolidated net worth as a percentage of future equity issuances (percent) |  |  | 75.00% |  |  |  |  |  |  |
Consolidated fixed charge ratio |  |  | 1.50 |  |  |  |  |  |  |
Maximum total secured debt ratio (percent) |  |  | 40.00% |  |  |  |  |  |  |
Increase to maximum total secured debt ratio upon closing of a material acquisition financed with secured debt (percent) |  |  | 5.00% |  |  |  |  |  |  |
Minimum unsecured interest coverage ratio |  |  | 2.00 |  |  |  |  |  |  |
Maximum total secured recourse debt ratio |  |  | 10.00% |  |  |  |  |  |  |
Maximum unhedged variable rate debt as a percent of total asset value |  |  | 30.00% |  |  |  |  |  |  |
Maximum payout ratio |  |  | 95.00% |  |  |  |  |  |  |
Maximum unimproved land as a percentage of total asset value (percent) |  |  | 5.00% |  |  |  |  |  |  |
Maximum pre-leased assets under development as a percentage of total asset value (percent) |  |  | 20.00% |  |  |  |  |  |  |
Maximum investments in unconsolidated affiliates as a percentage of total asset value (percent) |  |  | 10.00% |  |  |  |  |  |  |
Maximum investments in mortgages receivable as a percentage of total asset value (percent) |  |  | 15.00% |  |  |  |  |  |  |
Maximum leased assets under renovation as a percentage of total asset value (percent) |  |  | 10.00% |  |  |  |  |  |  |
Maximum aggregate investments as a percentage of total asset value (percent) |  |  | 25.00% |  |  |  |  |  |  |
Revolving Credit Facility | Swingline advances | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity | $ |  |  | $ 125,000,000 |  |  |  |  |  |  |
Initial term of debt instrument |  |  | 10 days |  |  |  |  |  |  |
Revolving Credit Facility | 2026 Term Loan | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Initial term of debt instrument |  |  | 7 years |  |  |  |  |  |  |
Minimum | Revolving Credit Facility | Revolving Commitment | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Commitment fee (percent) |  |  | 0.15% |  |  |  |  |  |  |
Maximum | Revolving Credit Facility | Revolving Commitment | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
Commitment fee (percent) |  |  | 0.20% |  |  |  |  |  |  |
Consolidated leverage ratio |  |  | 65.00% |  |  |  |  |  |  |
Restricted Stock Units (RSUs) | Mr. Escalante | Executive Officers | Time-Based Restricted Stock Unit Agreements | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
RSUs issued (shares) | shares |  | 732,218 |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) | Mr. Bitar | Executive Officers | Time-Based Restricted Stock Unit Agreements | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
RSUs issued (shares) | shares |  | 104,603 |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) | Mr. Hirsch | Executive Officers | Time-Based Restricted Stock Unit Agreements | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
RSUs issued (shares) | shares |  | 67,992 |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) | Mr. Sohn | Executive Officers | Time-Based Restricted Stock Unit Agreements | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
RSUs issued (shares) | shares |  | 52,301 |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) | Mr. Tausk | Executive Officers | Time-Based Restricted Stock Unit Agreements | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Item] |  |  |  |  |  |  |  |  |  |
RSUs issued (shares) | shares |  | 52,301 |  |  |  |  |  |  |  |

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