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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
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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%

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- 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

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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_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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