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v3.19.1

Mortgage Notes Payable, Net - Narrative (Details) $ in Billions | Mar. 31, 2019 USD ($)
--- | ---
Debt Instrument [Line Items] |
Carrying value of encumbered assets | $ 1.4
Line of Credit |
Debt Instrument [Line Items] |
Carrying value of encumbered assets | $ 1.2

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- Definition Real Estate and Accumulated Depreciation, Unencumbered Assets + References No definition available. + Details
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Namespace Prefix: | gnl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |