Related Party Transactions - Narrative (Details) | May 06, 2021$ / shares | May 06, 2020$ / shares | Aug. 14, 2018USD ($)$ / shares | Jun. 02, 2015USD ($) | Feb. 28, 2019 | Mar. 31, 2021USD ($)propertyshares | Sep. 30, 2020shares | Mar. 31, 2020USD ($) | Dec. 31, 2020USD ($)shares |
Related Party Transaction [Line Items] | | | | | | | | | |
Due from related parties | $ | | | | | | $ 346,000 | | | $ 377,000 |
Due to related parties | $ | | | | | | 845,000 | | | 2,002,000 |
Dividends payable | $ | | | | | | $ 5,386,000 | | | 5,152,000 |
Number of real estate properties, no longer subject to oversight fee (property) | property | | | | | | 39 | | | |
PMLA term | | | | | 1 year | | | | |
Property and management leasing agreement, termination notification term | | | | | 12 months | | | | |
Property manager termination notice | | | | | 60 days | | | | |
Advisor fee percentage | | | | | | 15.00% | | | |
Period to reinvest proceeds to not be included in the Sale | | | | | | 180 days | | | |
Advisor | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Cap on annum aggregate amount, range two | $ | | | $ 14,600,000,000 | | | | | | |
Maximum percent of assets under management, range three | | | 0.40% | | | | | | |
Maximum amount under management, range three | $ | | | $ 14,700,000,000 | | | | | | |
Leasing commissions incurred | $ | | | | | | $ 500,000 | | | 1,500,000 |
LTIP Units | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Distributions paid to partners | $ | | | | | | 100,000 | | $ 200,000 | |
Dividends payable | $ | | | | | | $ 0 | | | 0 |
Restricted shares | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Restricted shares granted (in shares) | shares | | | | | | 132,025 | 132,025 | | |
Global Net Lease Advisors, LLC | Advisor And Scott J. Bowman | Chief Executive Officer | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Direct membership interest | | | | | | 5.00% | | | |
Third party professional fees and offering costs | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Due to related parties | $ | | | | | | $ 800,000 | | | $ 2,000,000 |
Asset management fees | Advisor | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Leasing commissions incurred | $ | | | | | | $ 42,000 | | | |
AR Global, LLC | Global Net Lease Advisors, LLC | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Indirect membership interest | | | | | | 95.00% | | | |
Special Limited Partner | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Operating partnership units (in shares) | shares | | | | | | 35,900 | | | 35,900 |
Advisor | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Maximum percent of assets under management, range one | | | 0.75% | | | | | | |
Maximum amount under management, range one | $ | | | $ 3,000,000,000 | | | | | | |
Cap on annum aggregate amount, range two denominator | $ | | | $ 11,700,000,000 | | | | | | |
Minimum base management fee and incentive compensation payable, maximum percent of assets under management, range two | | | 0.35% | | | | | | |
Advisor | Properties Sold | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Gain (loss) on sale of property | $ | | | | | | $ 0 | | $ 0 | |
Advisor | Amended Advisory Agreement | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Minimum monthly base management fee | $ | | | | $ 18,000,000 | | | | | |
Amended Advisory Agreement, variable fee payable | | | | 1.25% | | | | | |
Amended Advisory Agreement, incentive compensation payable in cash | | | | 50.00% | | | | | |
Amended Advisory Agreement, incentive compensation payable in shares | | | | 50.00% | | | | | |
Amended Advisory Agreement, incentive compensation core AFFO per share, incentive hurdle one, period one (in dollars per share) | | | $ 2.15 | | | | | | |
Amended Advisory Agreement, incentive compensation core AFFO per share, incentive hurdle one, period two (in dollars per share) | | | 2.25 | | | | | | |
Incentive fee lower hurdle, aggregate, period one (in dollars per share) | | $ 1.6875 | | | | | | | |
Incentive fee lower hurdle, quarterly, period one (in dollars per share) | | 0.5625 | | | | | | | |
Incentive fee lower hurdle, aggregate, period two (in dollars per share) | | 1.35 | | | | | | | |
Incentive fee lower hurdle, quarterly, period two (in dollars per share) | | 0.45 | | | | | | | |
Incentive fee lower hurdle, aggregate, period three (in dollars per share) | | 1.125 | | | | | | | |
Incentive fee lower hurdle, quarterly, period three (in dollars per share) | | 0.5625 | | | | | | | |
Incentive fee lower hurdle, aggregate, period four (in dollars per share) | | 2.25 | | | | | | | |
Incentive fee lower hurdle, quarterly, period four (in dollars per share) | | 0.5625 | | | | | | | |
Amended Advisory Agreement, incentive compensation core AFFO per share, incentive hurdle two, period one (in dollars per share) | | | 2.79 | | | | | | |
Amended Advisory Agreement, incentive compensation core AFFO per share, incentive hurdle two, period two (in dollars per share) | | | $ 2.92 | | | | | | |
Incentive fee upper hurdle, aggregate, period one (in dollars per share) | | 2.19 | | | | | | | |
Incentive fee upper hurdle, quarterly, period one (in dollars per share) | | 0.73 | | | | | | | |
Incentive fee upper hurdle, aggregate, period two (in dollars per share) | | 1.75 | | | | | | | |
Incentive fee upper hurdle, quarterly, period two (in dollars per share) | | 0.583 | | | | | | | |
Incentive fee upper hurdle, aggregate, period three (in dollars per share) | | 1.46 | | | | | | | |
Incentive fee upper hurdle, quarterly, period three (in dollars per share) | | 0.73 | | | | | | | |
Incentive fee upper hurdle, aggregate, period four (in dollars per share) | | 2.92 | | | | | | | |
Incentive fee upper hurdle, quarterly, period four (in dollars per share) | | $ 0.73 | | | | | | | |
Minimum base management fee and incentive compensation payable, maximum percent of assets under management, range two | | | | 0.30% | | | | | |
Minimum base management fee and incentive compensation payable, maximum percent of assets under management, range one | | | | 1.25% | | | | | |
Minimum base management fee and incentive compensation payable, cap on annum aggregate amount, maximum amount of assets under management, range three | $ | | | | $ 5,000,000,000 | | | | | |
Minimum base management fee and incentive compensation payable, maximum percent of assets under management, range two | | | | 0.95% | | | | | |
Minimum base management fee and incentive compensation payable, cap on annum aggregate amount, maximum amount of assets under management, range two | $ | | | | $ 15,000,000,000 | | | | | |
Minimum base management fee and incentive compensation payable, cap on annum aggregate amount, maximum amount of assets under management, range three calculation base | | | | 1.25% | | | | | |
Minimum base management fee and incentive compensation payable, cap on annum aggregate amount, maximum amount of assets under management, range three calculation denominator | $ | | | | $ 10,000,000,000 | | | | | |
Amended Advisory Agreement, variable fee payable, maximum sale of investments to trigger possible reduction | $ | | | | 200,000,000 | | | | | |
Advisor | Amended Advisory Agreement | Subsequent Event | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Incentive fee lower hurdle, aggregate, period five (in dollars per share) | $ 1.95 | | | | | | | | |
Incentive fee lower hurdle, quarterly, period five (in dollars per share) | 0.4875 | | | | | | | | |
Incentive fee lower hurdle, aggregate, period six (in dollars per share) | 2.25 | | | | | | | | |
Incentive fee lower hurdle, quarterly, period six (in dollars per share) | 0.5625 | | | | | | | | |
Incentive fee upper hurdle, aggregate, period five (in dollars per share) | 2.62 | | | | | | | | |
Incentive fee upper hurdle, quarterly, period five (in dollars per share) | 0.655 | | | | | | | | |
Incentive fee upper hurdle, aggregate, period six (in dollars per share) | 2.92 | | | | | | | | |
Incentive fee upper hurdle, quarterly, period six (in dollars per share) | $ 0.73 | | | | | | | | |
Advisor | Amended Advisory Agreement | Minimum | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Amended Advisory Agreement, incentive compensation core AFFO per share, incentive hurdle possible annual increase | | | 0.00% | | | | | | |
Minimum base management fee and incentive compensation payable, cap on annum aggregate amount, maximum amount of assets under management, range three | $ | | | | 5,000,000,000 | | | | | |
Advisor | Amended Advisory Agreement | Maximum | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Amended Advisory Agreement, incentive compensation core AFFO per share, incentive hurdle possible annual increase | | | 3.00% | | | | | | |
Minimum base management fee and incentive compensation payable, cap on annum aggregate amount, maximum amount of assets under management, range three | $ | | | | $ 15,000,000,000 | | | | | |
Advisor | American Realty Capital Global Advisors, LLC | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Due from related parties | $ | | | | | | $ 300,000 | | | $ 400,000 |
Advisor | American Realty Capital Global Advisors, LLC | Maximum | Average Invested Assets | Greater Of | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Operating expenses as a percentage of benchmark | | | | | | 2.00% | | | |
Advisor | American Realty Capital Global Advisors, LLC | Maximum | Net Income, Excluding Additions to Non-cash Reserves and Gains on Sales of Assets | Greater Of | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Operating expenses as a percentage of benchmark | | | | | | 25.00% | | | |
Property Manager | American Realty Capital Global Properties, LLC | Maximum | Gross Revenue, Managed Properties | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Oversight fees as a percentage of benchmark | | | | | | 1.00% | | | |
Property Manager | American Realty Capital Global Properties, LLC | Maximum | Gross Revenue, Managed Properties | Stand Alone, Single Tenant, Net Leased | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Oversight fees as a percentage of benchmark | | | | | | 2.00% | | | |
Property Manager | American Realty Capital Global Properties, LLC | Maximum | Gross Revenue, Managed Properties | All Other Properties, Other than Stand Alone, Single Tenant, Net Leased | | | | | | | | | |
Related Party Transaction [Line Items] | | | | | | | | | |
Oversight fees as a percentage of benchmark | | | | | | 4.00% | | | |