Number Of Real Estate Properties, No Longer Subject To Oversight Fee

No definition available.

Name:	gnl_NumberOfRealEstatePropertiesNoLongerSubjectToOversightFee
Namespace Prefix:	gnl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Related Party Transaction, Incentive Compensation, Percent Payable in Cash

+ References

No definition available.

+ Details

Name:	gnl_RelatedPartyTransactionIncentiveCompensationPercentPayableinCash
Namespace Prefix:	gnl_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Related Party Transaction, Incentive Compensation, Percent Payable in Shares

+ References

No definition available.

+ Details

Name:	gnl_RelatedPartyTransactionIncentiveCompensationPercentPayableinShares
Namespace Prefix:	gnl_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Related Party Transaction, Minimum Monthly Base Management Fee

+ References

No definition available.

+ Details

Name:	gnl_RelatedPartyTransactionMinimumMonthlyBaseManagementFee
Namespace Prefix:	gnl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Related Party Transaction, Monthly Management Variable Fee, Percent

+ References

No definition available.

+ Details

Name:	gnl_RelatedPartyTransactionMonthlyManagementVariableFeePercent
Namespace Prefix:	gnl_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Related party transaction, operating expenses as a percentage of benchmark, fee cap

+ References

No definition available.

+ Details

Name:	gnl_RelatedPartyTransactionOperatingExpensesAsPercentageOfBenchmark
Namespace Prefix:	gnl_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Related Party Transaction, Oversight Fees Earned by Related Party, Percentage of Benchmark

+ References

No definition available.

+ Details

Name:	gnl_RelatedPartyTransactionOversightFeesEarnedByRelatedPartyPercentageOfBenchmark
Namespace Prefix:	gnl_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of commissions expense incurred because the lessor of real estate obtained a lessee for a rental property through a real estate agent.

+ References

No definition available.

+ Details

Name:	us-gaap_LeasingCommissionsExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense.

+ References

No definition available.

+ Details

Name:	us-gaap_OperatingCostsAndExpenses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

+ Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	gnl_RelatedPartyTransactionsByCostStatusAxis=gnl_IncurredMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=gnl_AdvisorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	gnl_RelatedPartyFeesByBenchmarkAxis=gnl_AverageInvestedAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=gnl_AmericanRealtyCapitalGlobalAdvisorsLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	gnl_MutuallyExclusiveOptionAxis=gnl_GreaterOfMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	gnl_RelatedPartyFeesByBenchmarkAxis=gnl_NetIncomeExcludingAdditionsToNonCashReservesAndGainsOnSalesOfAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=gnl_PropertyManagerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	gnl_RelatedPartyFeesByBenchmarkAxis=gnl_GrossRevenueManagedPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=gnl_AmericanRealtyCapitalGlobalPropertiesLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	gnl_PropertyTypeAxis=gnl_StandAloneSingleTenantNetLeasedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	gnl_PropertyTypeAxis=gnl_AllOtherPropertiesOtherthanStandAloneSingleTenantNetLeasedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=gnl_AmendedAdvisoryAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=gnl_AdvisorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=gnl_AdvisoryAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	gnl_RelatedPartyTransactionByFrequencyAxis=gnl_RecurringFeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	gnl_RelatedPartyTransactionsByCostAxis=gnl_IncentiveCompensationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Related Party Transactions - Narrative (Details)	1 Months Ended	12 Months Ended
Related Party Transactions - Narrative (Details)	Jun. 30, 2015	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2019 property	Apr. 30, 2019 property	Oct. 31, 2017 property
Related Party Transaction [Line Items]
Number of real estate properties, no longer subject to oversight fee (property) \| property					39	39	39
Incurred
Related Party Transaction [Line Items]
Related party expenses (reversals)			$ 1,200,000	$ 1,100,000
Advisor \| Average Invested Assets \| Maximum \| American Realty Capital Global Advisors, LLC \| Greater Of
Related Party Transaction [Line Items]
Operating expenses as a percentage of benchmark		2.00%
Advisor \| Net Income, Excluding Additions to Non-cash Reserves and Gains on Sales of Assets \| Maximum \| American Realty Capital Global Advisors, LLC \| Greater Of
Related Party Transaction [Line Items]
Operating expenses as a percentage of benchmark		25.00%
Property Manager \| Gross Revenue, Managed Properties \| Maximum \| American Realty Capital Global Properties, LLC
Related Party Transaction [Line Items]
Oversight fees as a percentage of benchmark		1.00%
Property Manager \| Stand Alone, Single Tenant, Net Leased \| Gross Revenue, Managed Properties \| Maximum \| American Realty Capital Global Properties, LLC
Related Party Transaction [Line Items]
Oversight fees as a percentage of benchmark		2.00%
Property Manager \| All other properties, other than stand alone, single tenant, net leased \| Gross Revenue, Managed Properties \| Maximum \| American Realty Capital Global Properties, LLC
Related Party Transaction [Line Items]
Oversight fees as a percentage of benchmark		4.00%
Amended Advisory Agreement \| Advisor
Related Party Transaction [Line Items]
Minimum monthly base management fee		$ 18,000,000.0
Variable fee, percent of cumulative net proceeds	1.25%
Incentive Compensation, percent payable in cash		50.00%
Incentive Compensation, percent payable in shares		50.00%
Advisor
Related Party Transaction [Line Items]
Leasing commissions incurred			1,300,000	3,800,000
Advisory Agreement \| Advisor
Related Party Transaction [Line Items]
Minimum monthly base management fee			18,000,000.0
Advisory Agreement \| Advisor \| Incurred \| Recurring Fees \| Incentive Compensation
Related Party Transaction [Line Items]
Related party expenses (reversals)			$ 0	$ 0