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Related Party Transactions - Narrative (Details) |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 14, 2018 USD ($) $ / shares | Jun. 02, 2015 USD ($) $ / shares | Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) shares | Oct. 31, 2017 property
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Due from related parties |  |  | $ 20,000 |  | $ 20,000 |  | $ 16,000 |
Number of real estate properties, no longer subject to oversight fee (property) | property |  |  |  |  |  |  |  | 12
Period to reinvest proceeds to not be included in the Sale |  |  |  |  | 180 years |  |  |
Due to related parties |  |  | 124,000 |  | $ 124,000 |  | $ 790,000 |
Stand Alone, Single Tenant, Net Leased | Gross Revenue, Managed Properties | Unaffiliated Third Party Property Management Services | Europe |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Property management fee, percent fee |  |  |  |  | 0.25% |  |  |
All Other Properties, Other than Stand Alone, Single Tenant, Net Leased | Gross Revenue, Managed Properties | Unaffiliated Third Party Property Management Services | Europe |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Property management fee, percent fee |  |  |  |  | 0.50% |  |  |
Singe Tenant Net Lease, Not Part of Shopping Center | Gross Revenue, Managed Properties | Unaffiliated Third Party Property Management Services | Europe |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Property management fee, percent fee |  |  |  |  | 1.75% |  |  |
All Other Property Types, Other Than Stand Alone, Single Tenant, Net Leased and Not Part of Shopping Center | Gross Revenue, Managed Properties | Unaffiliated Third Party Property Management Services | Europe |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Property management fee, percent fee |  |  |  |  | 3.50% |  |  |
Advisor |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Maximum percent of assets under management, range three | 0.40% |  |  |  |  |  |  |
Maximum amount under management, range three | $ 14,700,000,000 |  |  |  |  |  |  |
Advisor | Maximum |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Cap on annum aggregate amount, range two | $ 14,600,000,000 |  |  |  |  |  |  |
OP Units |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Distributions paid to partners |  |  |  | $ 100,000 |  | $ 100,000 |  |
LTIP Units |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Distributions paid to partners |  |  | $ 100,000 | 100,000 | $ 300,000 | 300,000 |  |
Global Net Lease Advisors, LLC | Advisor And Scott J. Bowman | Chief Executive Officer |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Direct membership interest |  |  | 5.00% |  | 5.00% |  |  |
Global Net Lease Advisors, LLC | Scott J. Bowman | Chief Executive Officer |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Direct membership interest |  |  | 10.00% |  | 10.00% |  |  |
AR Global, LLC | Global Net Lease Advisors, LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Indirect membership interest |  |  | 95.00% |  | 95.00% |  |  |
AR Global, LLC | Global Net Lease Advisors, LLC | Advisor |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Indirect membership interest |  |  | 90.00% |  | 90.00% |  |  |
Special Limited Partner |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Operating partnership units (shares) | shares |  |  | 35,900 |  | 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 | $ 3,000,000,000.0 |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |
Due to related parties |  |  |  |  |  |  | $ 49,000 |
Gain (loss) on sale of property |  |  |  |  | $ 0 |  |  |
Advisor | Amended Advisory Agreement |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Minimum monthly base management fee |  | $ 18,000,000.0 |  |  |  |  |  |
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% |  |  |  |  |  |
Percent of Core AFFO per weighted average share outstanding in excess of incentive hurdle one |  | 15.00% |  |  |  |  |  |
Amended Advisory Agreement, incentive compensation core AFFO per share, incentive hurdle one (usd per share) | $ / shares |  | $ 2.37 |  |  |  |  |  |
Percent of Core AFFO per weighted average share outstanding in excess of incentive hurdle two |  | 10.00% |  |  |  |  |  |
Amended Advisory Agreement, incentive compensation core AFFO per share, incentive hurdle two (usd per share) | $ / shares |  | $ 3.08 |  |  |  |  |  |
Amended Advisory Agreement, incentive compensation core AFFO per share, incentive hurdle one, period one (usd per share) | $ / shares | $ 2.15 |  |  |  |  |  |  |
Amended Advisory Agreement, incentive compensation core AFFO per share, incentive hurdle one, period two (usd per share) | $ / shares | 2.25 |  |  |  |  |  |  |
Amended Advisory Agreement, incentive compensation core AFFO per share, incentive hurdle two, period one (usd per share) | $ / shares | 2.79 |  |  |  |  |  |  |
Amended Advisory Agreement, incentive compensation core AFFO per share, incentive hurdle two, period two (usd per share) | $ / shares | $ 2.92 |  |  |  |  |  |  |
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 |  | $ 5,000,000,000.0 |  |  |  |  |  |
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 |  | $ 15,000,000,000.0 |  |  |  |  |  |
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 |  | $ 10,000,000,000.0 |  |  |  |  |  |
Amended Advisory Agreement, variable fee payable, maximum sale of investments to trigger possible reduction |  | $ 200,000,000.0 |  |  |  |  |  |
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% | 1.00% |  |  |  |  |  |
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% | 3.00% |  |  |  |  |  |
Minimum base management fee and incentive compensation payable, cap on annum aggregate amount, maximum amount of assets under management, range three |  | $ 15,000,000,000.0 |  |  |  |  |  |
Advisor | American Realty Capital Global Advisors, LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Due from related parties |  |  | $ 20,000 |  | $ 20,000 |  | $ 16,000 |
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% |  | 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% |  | 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% |  | 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% |  | 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% |  | 4.00% |  |  |
Incurred |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party expenses |  |  | $ 8,162,000 | 6,790,000 | $ 16,205,000 | 13,618,000 |  |
Incurred | Recurring Fees | Incentive compensation |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party expenses |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  |

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