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Real Estate Investments, Net - Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Details)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Entity-wide revenue percentage	52.90%	48.90%
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Entity-wide revenue percentage	20.30%	22.10%

X

- Definition

Entity Wide Revenue, Major State, Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	gnl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_StatementGeographicalAxis=country_US
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_GB
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: