v3.22.2.2

Acquisitions of Rental Property - Purchase Price Allocation for Real Estate Acquisitions (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Non-real estate liabilities assumed |  | $ (8,051) | $ 0 |
Business combination, recognized identifiable assets acquired and liabilities assumed, assets |  | 584,071 | 516,136 | [1]
Land |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, property, plant, and equipment |  | 101,278 | 72,829 |
Land Improvements |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, property, plant, and equipment |  | 37,578 | 22,103 |
Buildings and Improvements |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, property, plant, and equipment |  | 406,994 | 379,946 |
Acquired In-Place Leases |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, Intangible assets | [2] | (46,348) | (40,865) |
Acquired Above-Market Lease |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, Intangible assets |  | 0 | (211) | [3]
Acquired Below-Market Leases |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, Intangible assets | [4] | (76) | 0 |
Right-of-use asset |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, Intangible assets |  | 0 | (663) |
Lease liability |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, Intangible assets |  | $ 0 | $ (481) |
[1] | Excludes $17.4 million building expansion agreed to as a forward commitment in connection with a prior acquisition (see Note 18)
[2] | The weighted average amortization period for acquired in-place leases is 20 years and 17 years for acquisitions completed during the nine months ended September 30, 2022 and 2021, respectively.
[3] | The weighted average amortization period for the acquired above-market leases is 10 years for acquisitions completed during the nine months ended September 30, 2021. There were no above-market leases acquired during the nine months ended September 30, 2022.
[4] | The weighted average amortization period for acquired below-market leases is 9 years for acquisitions completed during the nine months ended September 30, 2022. There were no below-market leases acquired during the nine months ended September 30, 2021.

X
- Definition Business combination recognized identifiable assets acquired and liabilities assumed intangible liabilities. + References No definition available. + Details
Name: | bnl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLiabilities
Namespace Prefix: | bnl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=128092470&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI https://asc.fasb.org/extlink&oid=123455525&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=128092470&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=128092470&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI https://asc.fasb.org/extlink&oid=123455525&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=128092470&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_LeasesAcquiredInPlaceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=bnl_AcquiredAboveMarketLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=bnl_BelowMarketLeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=bnl_RightOfUseAssetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_LeaseAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |