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v3.23.1

Real Estate Investments, Net - Schedule of Acquisitions by Property Type (Details) | Mar. 31, 2023 ft² property
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Real Estate Properties [Line Items] |
Number of Properties | property | 317
Square Feet (unaudited) | ft² | 39,600,000
Properties Acquired in 2023 |
Real Estate Properties [Line Items] |
Number of Properties | property | 8
Square Feet (unaudited) | ft² | 323,730
Office | Properties Acquired in 2023 |
Real Estate Properties [Line Items] |
Number of Properties | property | 0
Square Feet (unaudited) | ft² | 0
Industrial | Properties Acquired in 2023 |
Real Estate Properties [Line Items] |
Number of Properties | property | 0
Square Feet (unaudited) | ft² | 0
Distribution | Properties Acquired in 2023 |
Real Estate Properties [Line Items] |
Number of Properties | property | 0
Square Feet (unaudited) | ft² | 0
Retail | Properties Acquired in 2023 |
Real Estate Properties [Line Items] |
Number of Properties | property | 8
Square Feet (unaudited) | ft² | 323,730

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- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- 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 No definition available. + Details
Name: | us-gaap_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | gnl_RealEstatePropertyAcquisitionsAxis=gnl_RealEstatePropertiesAcquiredIn2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_OfficeBuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_IndustrialPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=gnl_DistributionPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_RetailSiteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |