v3.24.3

Credit Risk Concentrations - Additional Information (Detail) - Customer | 9 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Concentration Risk [Line Items] |  |
Lease revenue, net, percentage | 10.00% | 10.00%
Number of tenants or common franchises | 0 | 0

X
- Definition Lease revenue, net, percentage + References No definition available. + Details
Name: | bnl_LeaseRevenueNetPercentage
Namespace Prefix: | bnl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of major customer. + References No definition available. + Details
Name: | bnl_NumberOfMajorCustomer
Namespace Prefix: | bnl_
Data Type: | xbrli:integerItemType
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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 310 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478785/954-310-50-2 + Details
Name: | us-gaap_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration