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Mortgage Notes Payable, Net - Narrative (Details) $ in Billions	Jun. 30, 2019 USD ($)
Debt Instrument [Line Items]
Carrying value of encumbered assets	$ 1.3
Line of Credit
Debt Instrument [Line Items]
Carrying value of encumbered assets	$ 1.0

X

- Definition

Real Estate and Accumulated Depreciation, Unencumbered Assets

+ References

No definition available.

+ Details

Name:	gnl_RealEstateandAccumulatedDepreciationUnencumberedAssets
Namespace Prefix:	gnl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

X

- Details

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