Related Party Transactions - Narrative (Details)				3 Months Ended
	Nov. 06, 2018 USD ($)	Aug. 14, 2018 USD ($) $ / shares	Jun. 02, 2015 USD ($) $ / shares	Mar. 31, 2019 USD ($) shares	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) shares	Oct. 31, 2017 property
Related Party Transaction [Line Items]
Due from related parties				$ 20,000		$ 16,000
Dividends payable				$ 2,721,000		2,664,000
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
Due to related parties				$ 472,000		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%
LTIP Units
Related Party Transaction [Line Items]
Dividends payable						0
2015 OPP
Related Party Transaction [Line Items]
Dividends payable						$ 0
LTIP Units
Related Party Transaction [Line Items]
Distributions paid to partners				$ 100,000	$ 200,000
OP Units
Related Party Transaction [Line Items]
Distributions paid to partners					100,000
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
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%
Maximum percent of assets under management, range three	0.40%
Maximum amount under management, range three	$ 14,700,000,000
Advisor | Properties Sold
Related Party Transaction [Line Items]
Due to related parties				$ 49,000
Gain (loss) on sale of property				0
Advisor | Maximum
Related Party Transaction [Line Items]
Cap on annum aggregate amount, range two	$ 14,600,000,000
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 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		$ 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%
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%
Recurring Fees | Property Management and Leasing Fees
Related Party Transaction [Line Items]
Related party expenses					0
Incurred
Related Party Transaction [Line Items]
Related party expenses				$ 8,043,000	6,831,000
Incurred | Recurring Fees | Incentive compensation
Related Party Transaction [Line Items]
Related party expenses				0	0
Incurred | Recurring Fees | Property Management and Leasing Fees
Related Party Transaction [Line Items]
Related party expenses				$ 1,372,000	$ 1,172,000