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CONVERTIBLE PREFERRED SHARES (Details)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Series A Convertible Preferred Stock
USD ($)
Dec. 31, 2013
Series A Convertible Preferred Stock
USD ($)
Jul. 07, 2011
Series A Convertible Preferred Stock
Tencent and Matrix
USD ($)
Jul. 07, 2011
Series A Convertible Preferred Stock
Tencent and Matrix
CNY
Jul. 07, 2011
Series A Convertible Preferred Stock
Tencent and Matrix
USD ($)
Dec. 31, 2013
Series B Convertible Preferred Stock
CNY
Dec. 31, 2014
Series B Convertible Preferred Stock
USD ($)
Dec. 31, 2013
Series B Convertible Preferred Stock
USD ($)
Jun. 24, 2013
Series B Convertible Preferred Stock
Tencent and Kingsoft
USD ($)
Jun. 24, 2013
Series B Convertible Preferred Stock
Tencent and Kingsoft
CNY
Jun. 24, 2013
Series B Convertible Preferred Stock
Tencent and Kingsoft
USD ($)
Class of Stock [Line Items]                        
Preferred share issues (in shares)   0us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= cmcm_SeriesAConvertiblePreferredStockMember
102,409,639us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= cmcm_SeriesAConvertiblePreferredStockMember
    102,409,639us-gaap_TemporaryEquitySharesIssued
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cmcm_TCHCopperLimitedAndMatrixMember
/ us-gaap_StatementClassOfStockAxis
= cmcm_SeriesAConvertiblePreferredStockMember
  0us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= cmcm_SeriesBConvertiblePreferredStockMember
122,495,531us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= cmcm_SeriesBConvertiblePreferredStockMember
    122,495,531us-gaap_TemporaryEquitySharesIssued
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cmcm_TencentAndKingsoftMember
/ us-gaap_StatementClassOfStockAxis
= cmcm_SeriesBConvertiblePreferredStockMember
Preferred share par value per share   $ 0.000025us-gaap_TemporaryEquityParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= cmcm_SeriesAConvertiblePreferredStockMember
$ 0.000025us-gaap_TemporaryEquityParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= cmcm_SeriesAConvertiblePreferredStockMember
    $ 0.18142076us-gaap_TemporaryEquityParOrStatedValuePerShare
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cmcm_TCHCopperLimitedAndMatrixMember
/ us-gaap_StatementClassOfStockAxis
= cmcm_SeriesAConvertiblePreferredStockMember
  $ 0.000025us-gaap_TemporaryEquityParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= cmcm_SeriesBConvertiblePreferredStockMember
$ 0.000025us-gaap_TemporaryEquityParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= cmcm_SeriesBConvertiblePreferredStockMember
    $ 0.42615738us-gaap_TemporaryEquityParOrStatedValuePerShare
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cmcm_TencentAndKingsoftMember
/ us-gaap_StatementClassOfStockAxis
= cmcm_SeriesBConvertiblePreferredStockMember
Preferred share issues, consideration       $ 18,579us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cmcm_TCHCopperLimitedAndMatrixMember
/ us-gaap_StatementClassOfStockAxis
= cmcm_SeriesAConvertiblePreferredStockMember
120,237us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cmcm_TCHCopperLimitedAndMatrixMember
/ us-gaap_StatementClassOfStockAxis
= cmcm_SeriesAConvertiblePreferredStockMember
  321,965us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock
/ us-gaap_StatementClassOfStockAxis
= cmcm_SeriesBConvertiblePreferredStockMember
    $ 52,202us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cmcm_TencentAndKingsoftMember
/ us-gaap_StatementClassOfStockAxis
= cmcm_SeriesBConvertiblePreferredStockMember
322,541us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cmcm_TencentAndKingsoftMember
/ us-gaap_StatementClassOfStockAxis
= cmcm_SeriesBConvertiblePreferredStockMember
 
Features of Convertible Preferred Stock [Abstract]                        
Conversion ratio 1cmcm_TemporaryEquityConversionRatio