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INCOME TAXES - VIEs AND SUBSIDIARIES (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2015 CNY (¥) ¥ / shares | Dec. 31, 2014 CNY (¥) ¥ / shares | Dec. 31, 2013 CNY (¥) ¥ / shares
Income Taxes |  |  |  |
Tax withheld provision |  | ¥ 0 |  |
Statutory rate | 25.00% | 25.00% | 25.00% | 25.00%
Cayman Island |  |  |  |
Income Taxes |  |  |  |
Tax withheld provision |  | ¥ 0 |  |
British Virgin Island |  |  |  |
Income Taxes |  |  |  |
Tax withheld provision |  | ¥ 0 |  |
UNITED STATES | Cheetah Mobile America |  |  |  |
Income Taxes |  |  |  |
Foreign statutory tax rate | 35.00% | 35.00% |  |
UNITED STATES | Mob Inc |  |  |  |
Income Taxes |  |  |  |
Foreign statutory tax rate | 35.00% | 35.00% |  |
HONG KONG | Cheetah Technology |  |  |  |
Income Taxes |  |  |  |
Foreign statutory tax rate | 16.50% | 16.50% |  |
HONG KONG | HK Zoom |  |  |  |
Income Taxes |  |  |  |
Foreign statutory tax rate | 16.50% | 16.50% |  |
HONG KONG | Youloft HK |  |  |  |
Income Taxes |  |  |  |
Foreign statutory tax rate | 16.50% | 16.50% |  |
HONG KONG | Cheetah Information |  |  |  |
Income Taxes |  |  |  |
Foreign statutory tax rate | 16.50% | 16.50% |  |
HONG KONG | Mob HK |  |  |  |
Income Taxes |  |  |  |
Foreign statutory tax rate | 16.50% | 16.50% |  |
SINGAPORE | Cheetah Mobile Singapore Pte Ltd |  |  |  |
Income Taxes |  |  |  |
Foreign statutory tax rate | 17.00% | 17.00% |  |
FRANCE | MobPartner Inc. |  |  |  |
Income Taxes |  |  |  |
Foreign statutory tax rate | 33.33% | 33.33% |  |
UNITED KINGDOM | MobPartner UK Limited |  |  |  |
Income Taxes |  |  |  |
Foreign statutory tax rate | 20.00% | 20.00% |  |
PRC |  |  |  |
Income Taxes |  |  |  |
Statutory rate | 25.00% | 25.00% |  |
Withholding income tax rate for dividend paid to foreign tax resident investors (as a percent) | 10.00% | 10.00% |  |
PRC | New Software Development Enterprise |  |  |  |
Income Taxes |  |  |  |
Exemption period for income tax | 2 years | 2 years |  |
Period for reduction in tax percentage | 3 years | 3 years |  |
Reduction in tax rate for three years following the exemption period (as a percent) | 50.00% | 50.00% |  |
Income Tax Holiday, Aggregate Dollar Amount | $ 3,288 | ¥ 21,301 | ¥ 40,509 | ¥ 4,430
Income tax holiday, income tax benefits per share | (per share) | $ 0.0024 | ¥ 0.0155 | ¥ 0.0314 | ¥ 0.0041
PRC | Beijing Security | New Software Development Enterprise |  |  |  |
Income Taxes |  |  |  |
Preferential tax rate (as a percent) | 15.00% | 15.00% | 12.50% | 12.50%
PRC | Conew Network and Beijing Mobile | New Software Development Enterprise |  |  |  |
Income Taxes |  |  |  |
Statutory rate |  |  | 12.50% | 12.50%
PRC | Zhuhai Juntian | New Software Development Enterprise |  |  |  |
Income Taxes |  |  |  |
Preferential tax rate (as a percent) | 15.00% | 15.00% | 15.00% | 12.50%
PRC | Zhuhai Juntian and Beijing Security | HNTE |  |  |  |
Income Taxes |  |  |  |
Preferential tax rate (as a percent) | 15.00% | 15.00% |  |

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