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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) pure in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Conversion ratio, ADS to Class A ordinary share	10	10	10

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- Definition

Conversion ratio of American Depositary Share (ADS) to Class A ordinary share.

+ References

No definition available.

+ Details

Name:	cmcm_SharesConversionRatio
Namespace Prefix:	cmcm_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration