Related Party Transactions - Narrative (Details)				1 Months Ended	3 Months Ended		9 Months Ended
	May 06, 2020 $ / shares	Aug. 14, 2018 USD ($) $ / shares	Jun. 02, 2015 USD ($)	Feb. 28, 2019	Sep. 30, 2020 USD ($) property shares	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) property shares	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) shares
Related Party Transaction [Line Items]
Due from related parties					$ 366,000		$ 366,000		$ 351,000
Due to related parties					24,000		24,000		342,000
Dividends payable					$ 5,014,000		$ 5,014,000		4,006,000
Number of real estate properties, no longer subject to oversight fee (property) | property					39		39
PMLA term				1 year
PMLA renewal term				1 year
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
LTIP Units
Related Party Transaction [Line Items]
Distributions paid to partners					$ (100,000)	$ (100,000)	$ (300,000)	$ (400,000)
Dividends payable					$ 0		$ 0		0
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%
Third party professional fees and offering costs
Related Party Transaction [Line Items]
Due to related parties					$ 24,000		$ 24,000		$ 300,000
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 (in 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]
Gain (loss) on sale of property							$ 0	0
Advisor | Amended Advisory Agreement
Related Party Transaction [Line Items]
Minimum monthly base management fee			$ 18,000,000.0
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%
Amended Advisory Agreement, incentive compensation core AFFO per share, incentive hurdle one, period one (in dollars per share) | $ / shares		$ 2.15
Amended Advisory Agreement, incentive compensation core AFFO per share, incentive hurdle one, period two (in dollars per share) | $ / shares		2.25
Incentive fee lower hurdle, aggregate, period one (in dollars per share) | $ / shares	$ 1.6875
Incentive fee lower hurdle, quarterly, period one (in dollars per share) | $ / shares	0.5625
Incentive fee lower hurdle, aggregate, period two (in dollars per share) | $ / shares	1.35
Incentive fee lower hurdle, quarterly, period two (in dollars per share) | $ / shares	0.45
Incentive fee lower hurdle, aggregate, period three (in dollars per share) | $ / shares	1.125
Incentive fee lower hurdle, quarterly, period three (in dollars per share) | $ / shares	0.5625
Incentive fee lower hurdle, aggregate, period four (in dollars per share) | $ / shares	2.25
Incentive fee lower hurdle, quarterly, period four (in dollars per share) | $ / shares	0.5625
Amended Advisory Agreement, incentive compensation core AFFO per share, incentive hurdle two, period one (in dollars per share) | $ / shares		2.79
Amended Advisory Agreement, incentive compensation core AFFO per share, incentive hurdle two, period two (in dollars per share) | $ / shares		$ 2.92
Incentive fee upper hurdle, aggregate, period one (in dollars per share) | $ / shares	2.19
Incentive fee upper hurdle, quarterly, period one (in dollars per share) | $ / shares	0.73
Incentive fee upper hurdle, aggregate, period two (in dollars per share) | $ / shares	1.75
Incentive fee upper hurdle, quarterly, period two (in dollars per share) | $ / shares	0.583
Incentive fee upper hurdle, aggregate, period three (in dollars per share) | $ / shares	1.46
Incentive fee upper hurdle, quarterly, period three (in dollars per share) | $ / shares	0.73
Incentive fee upper hurdle, aggregate, period four (in dollars per share) | $ / shares	2.92
Incentive fee upper hurdle, quarterly, period four (in dollars per share) | $ / shares	$ 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			$ 5,000,000,000.0
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%
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%
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					$ 400,000		$ 400,000		$ 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%		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					$ 8,939,000	8,220,000	$ 26,607,000	24,425,000
Recurring Fees | Incurred | Incentive compensation
Related Party Transaction [Line Items]
Related party expenses					$ 24,000	$ 0	$ 24,000	$ 0