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Related Party Transactions - Schedule Of Related Parties And Nature Of Relationship (Detail)	12 Months Ended
	Dec. 31, 2021
Kingsoft Group [Member]
Related Party Transaction [Line Items]
Nature of Common Ownership or Management Control Relationships	Principal shareholder of the Company
Cheetah Group [Member]
Related Party Transaction [Line Items]
Nature of Common Ownership or Management Control Relationships	Entity that Kingsoft Corporation Limited exercises significant influence over
Xiaomi Group [Member]
Related Party Transaction [Line Items]
Nature of Common Ownership or Management Control Relationships	Entity controlled by a director of the Company

X

- Definition

This element represents a description of the nature of common ownership or management control relationships with other entities, regardless of there being transactions between the entities, when the existence of that control could result in operating results or financial position of the reporting entity significantly different from that which would have been obtained if the entities' were autonomous.

+ References

No definition available.

+ Details

Name:	us-gaap_NatureOfCommonOwnershipOrManagementControlRelationships
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=kc_KingsoftGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=kc_CheetahGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=kc_XiaomiGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: