v3.24.3

Earnings per Share - Summary of Components used in Calculation of Basic and Diluted Earnings per Share (Parenthetical) (Detail) - shares	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Unvested restricted shares of common stock	979,140	505,668
Weighted average effects of OP Units outstanding	8,754,702	9,282,953

X

- Definition

Unvested restricted shares of common stock.

+ References

No definition available.

+ Details

Name:	bnl_UnvestedRestrictedSharesOfCommonStock
Namespace Prefix:	bnl_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_EarningsPerShareAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of units or equivalent units outstanding for all classes.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant