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Contract Assets, Net - Schedule of provision for contract assets and allowance for credit losses (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)	Dec. 31, 2022 CNY (¥)
Schedule of provision for contract assets and allowance for credit losses [Line Items]
Balance at the beginning of the year	¥ 58,790	$ 8,054	¥ 35,770	¥ 14,478
Provision for credit losses	3,066	420	23,020	21,292
Balance at the end of the year	¥ 61,856	$ 8,474	¥ 58,790	¥ 35,770

X

- Definition

Contract With Customer Asset Period Increase Decrease

+ References

No definition available.

+ Details

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Namespace Prefix:	bnr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Schedule of provision for contract assets and allowance for credit losses

+ References

No definition available.

+ Details

Name:	bnr_ScheduleOfProvisionForContractAssetsAndAllowanceForCreditLossesLineItems
Namespace Prefix:	bnr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of allowance for credit loss for right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant