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Related Party Transactions - Narrative (Details) |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 14, 2018 $ / shares | Apr. 01, 2017 shares | Dec. 22, 2016 USD ($) installment | Dec. 16, 2016 USD ($) shares | Jun. 02, 2015 USD ($) $ / shares | Sep. 30, 2018 USD ($) shares | Sep. 30, 2017 USD ($) | Jun. 30, 2017 shares | Sep. 30, 2018 USD ($) shares | Sep. 30, 2017 USD ($) property | Dec. 31, 2017 USD ($) shares | Oct. 31, 2017 property
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Due from related parties |  |  |  |  |  | $ 16,000 |  |  | $ 16,000 |  | $ 16,000 |
Due to related parties |  |  |  |  |  | 782,000 |  |  | 782,000 |  | 829,000 |
Conversion of stock (shares) | shares |  | 181,841 |  |  |  |  |  | 181,841 |  |  |  |
Distributions paid |  |  |  |  |  |  |  |  | 448,000 | $ 574,000 |  |
Dividends payable |  |  |  |  |  | 2,638,000 |  |  | $ 2,638,000 |  | 2,556,000 |
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 days |  |  |
Cash paid for acquired real estate investments |  |  |  |  |  |  |  |  |  | 30,300,000 |  |
Properties Sold |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  |  |  |  |  |  |  | $ 600,000 |  |
Kulicke & Soffa |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold (property) | property |  |  |  |  |  |  |  |  |  | 1 |  |
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% |  |  |
The Letter Agreement |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Related party notes receivable acquired in Merger |  |  | $ 5,100,000 | $ 6,300,000 |  |  |  |  |  |  |  |
Percent over gross offering proceeds to trigger Advisor reimbursement |  |  |  | 2.00% |  |  |  |  |  |  |  |
Period of installments |  |  |  | 8 months |  |  |  |  |  |  |  |
Multiple for valuing Class B Units |  |  |  | 2.27 |  |  |  |  |  |  |  |
Period for valuing Class B Units |  |  |  | 30 days |  |  |  |  |  |  |  |
Number of equal cash installments (installment) | installment |  |  | 8 |  |  |  |  |  |  |  |  |
The Letter Agreement | Class B Units |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares as reimbursement (shares) | shares |  |  |  | 66,344 |  |  |  |  |  |  |  |
2015 OPP |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable |  |  |  |  |  | $ 0 |  |  | $ 0 |  | $ 0 |
OP Units |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Units outstanding (shares) | shares |  |  |  |  |  | 0 |  |  | 0 |  | 0 |
Distributions paid to partners |  |  |  |  |  |  |  |  |  | $ 100,000 |  |
LTIP Units |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distributions paid |  |  |  |  |  | $ 200,000 |  |  | $ 400,000 | 500,000 |  |
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% |  |  |
Third party professional fees and offering costs |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Due to related parties |  |  |  |  |  | $ 800,000 |  |  | $ 800,000 |  | $ 800,000 |
Property Operating and General Administrative Expenses |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Related party expenses |  |  |  |  |  | $ 0 | $ 0 |  | $ 0 | 0 |  |
AR Global, LLC | Global Net Lease Advisors, LLC |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Indirect membership interest |  |  |  |  |  | 95.00% |  |  | 95.00% |  |  |
Special Limited Partner |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating partnership units (shares) | shares |  |  |  |  |  | 35,900 |  |  | 35,900 |  | 39,904 |
Advisor | Properties Sold |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Due to related parties |  |  |  |  |  | $ 49,000 |  |  | $ 49,000 |  | $ 49,000 |
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% |  |  |  |  |  |  |
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 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 |  |  |  |  |  |  |
Minimum base management fee and incentive compensation payable, maximum percent of assets under management, range three |  |  |  |  | 0.30% |  |  |  |  |  |  |
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% |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
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 |  |  |  |  |  | 16,000 |  |  | 16,000 |  | $ 16,000 |
Related party expenses |  |  |  |  |  | $ 0 | 0 |  | $ 0 | 0 |  |
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% |  |  |
Advisor | AR Global, LLC | Global Net Lease Advisors, LLC |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Indirect membership interest |  |  |  |  |  | 90.00% |  |  | 90.00% |  |  |
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 |  |  |  |  |  | $ 6,956,000 | 6,368,000 |  | $ 20,925,000 | 18,988,000 |  |
Incurred | Recurring Fees | Incentive compensation |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Related party expenses |  |  |  |  |  | $ 361,000 | $ 0 |  | $ 361,000 | $ 0 |  |

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