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Related Party Transactions - Additional Information (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Allowance for doubtful accounts	¥ 7,312	$ 1,124	¥ 8,282

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- Definition

Represents information pertaining to valuation allowance for trade and other receivables due to an Entity, from a related party, that are expected to be uncollectible.

+ References

No definition available.

+ Details

Name:	cmcm_RelatedPartyTransactionAllowanceForDoubtfulAccountsReceivable
Namespace Prefix:	cmcm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant