v3.22.2.2

Business Description - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2022 Property Provinces State
Business Description [Line Items] |
Date of incorporation | Oct. 18, 2007
Number of leased commercial properties owned | 790
UNITED STATES |
Business Description [Line Items] |
Number of leased commercial properties owned | 783
Number of States in which properties located | State | 44
Canada |
Business Description [Line Items] |
Number of leased commercial properties owned | 7
Number of provinces | Provinces | 4

X
- Definition Business description line items. + References No definition available. + Details
Name: | bnl_BusinessDescriptionLineItems
Namespace Prefix: | bnl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Provinces + References No definition available. + Details
Name: | bnl_NumberOfProvinces
Namespace Prefix: | bnl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Date when an entity was incorporated + References No definition available. + Details
Name: | dei_EntityIncorporationDateOfIncorporation
Namespace Prefix: | dei_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

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