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Prepayments and Others and Assets (Parenthetical) (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 CNY (¥)		Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	[1]	Dec. 28, 2017 CNY (¥)	Dec. 28, 2017 USD ($)
Convertible loan	¥ 22,000	[1]		$ 3,381		¥ 22,000	$ 3,381
Loan loss	¥ 30,839		$ 4,740
[1] On December 28, 2017, the Group made a convertible loan investment of RMB22,000 to a third-party retail company. The conversion features and the put option were considered as embedded derivatives that do not meet the criteria to be bifurcated and were accounted for together with the loan receivable. In accordance with ASC 810, Consolidation, the third-party retail company is a variable interest entity, as it does not have sufficient equity at risk to fully fund the construction of all assets required for principal operations. As of December 31, 2017, the Group's maximum exposure to loss as a result of its involvement with the third-party retail company was RMB30,839 (US$4,740), which also equals to the carrying amount of the convertible loan and advance. The Group is not considered as the primary beneficiary, as it does not has power to direct the activities of the third-party retail company that most significantly impact its economic performance.

X

- Definition

Loss exposure to loan receivable.

+ References

No definition available.

+ Details

Name:	cmcm_LossExposureToLoanReceivable
Namespace Prefix:	cmcm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_LoansReceivableNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant