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Commitments And Contingencies - Additional Information (Detail) ¥ in Millions | Dec. 31, 2021 CNY (¥)
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Future Minimum Advertising Commitments [Member] |
Commitments And Contingencies Disclosure [LineItems] |
Non cancellable contractual obligation | ¥ 132.1

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- Definition Commitments and contingencies disclosure . + References No definition available. + Details
Name: | bz_CommitmentsAndContingenciesDisclosureLineItems
Namespace Prefix: | bz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_OtherCommitmentsAxis=bz_FutureMinimumAdvertisingCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |