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SUBSEQUENT EVENTS(Details)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended
May 08, 2014
Dec. 31, 2014
Subsequent Event
USD ($)
Dec. 31, 2014
Subsequent Event
CNY
Mar. 25, 2015
Series B Preferred Stock
Subsequent Event
USD ($)
Mar. 15, 2015
Mob Partner
Subsequent Event
USD ($)
Mar. 15, 2015
Mob Partner
Subsequent Event
Feb. 10, 2015
Wuhan Antian
Subsequent Event
USD ($)
Feb. 10, 2015
Wuhan Antian
Subsequent Event
CNY
Jan. 26, 2015
Quwan Limited
Series D Preferred Stock
Subsequent Event
USD ($)
Jan. 26, 2015
Quwan Limited
ADS
Subsequent Event
USD ($)
Subsequent Event [Line Items]                    
Percentage of interest disposed off             20.00%cmcm_PercentageOfEquityInterestDisposedOff
/ dei_LegalEntityAxis
= cmcm_WuhanAntianMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
20.00%cmcm_PercentageOfEquityInterestDisposedOff
/ dei_LegalEntityAxis
= cmcm_WuhanAntianMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Cash Consideration             $ 2,095us-gaap_BusinessCombinationConsiderationTransferred1
/ dei_LegalEntityAxis
= cmcm_WuhanAntianMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
13,000us-gaap_BusinessCombinationConsiderationTransferred1
/ dei_LegalEntityAxis
= cmcm_WuhanAntianMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Total consideration       20,000cmcm_ConsiderationInAcquiringPreferredShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
58cmcm_ConsiderationInAcquiringPreferredShares
/ us-gaap_BusinessAcquisitionAxis
= cmcm_MobPartnerSasMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
      21,000cmcm_ConsiderationInAcquiringPreferredShares
/ dei_LegalEntityAxis
= cmcm_QuwanLimitedMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Issue Of American Depositary Shares 17,371,428cmcm_IssueOfAmericanDepositaryShares                 799,630cmcm_IssueOfAmericanDepositaryShares
/ dei_LegalEntityAxis
= cmcm_QuwanLimitedMember
/ us-gaap_StatementClassOfStockAxis
= cmcm_AmericanDepositarySharesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Number of shares acquired       1,831,754cmcm_NumberOfSharesAcquired
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
        5,570,292cmcm_NumberOfSharesAcquired
/ dei_LegalEntityAxis
= cmcm_QuwanLimitedMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Cash consideration to acquire preferred shares                 7,070cmcm_CashConsiderationInAcquiringPreferredShares
/ dei_LegalEntityAxis
= cmcm_QuwanLimitedMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Fair value of shares issued                   13,930cmcm_FairValueOfSharesIssued
/ dei_LegalEntityAxis
= cmcm_QuwanLimitedMember
/ us-gaap_StatementClassOfStockAxis
= cmcm_AmericanDepositarySharesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Percentage of ownership           100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= cmcm_MobPartnerSasMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Aggregate cash consideration   $ 37,960cmcm_AggregateCashConsiderationToAcquireInvestments
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
235,529cmcm_AggregateCashConsiderationToAcquireInvestments
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember