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Earnings (Losses) Per Share (Detail) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 CNY (¥) ¥ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 CNY (¥) ¥ / shares shares | Dec. 31, 2015 CNY (¥) ¥ / shares shares
Numerator: |  |  |  |
Net income (loss) attributable to Cheetah Mobile Inc. | ¥ 1,348,194 | $ 207,213 | ¥ (80,525) | ¥ 176,347
Accretion of redeemable noncontrolling interests | ¥ | 13,451 |  | 0 | 0
Net income (loss) attributable to Cheetah Mobile Inc. after accretion of redeemable noncontrolling interests | ¥ |  |  | ¥ (80,525) | ¥ 176,347
Weighted average ordinary shares outstanding |  |  | 1,387,254,551 | 1,372,863,321
Denominator: |  |  |  |
Weighted average number of ordinary shares outstanding |  |  | 1,387,254,551 | 1,372,863,321
Earnings (Losses) per share - basic | ¥ / shares |  |  | ¥ (0.0580) | ¥ 0.1285
Denominator used for earnings (losses) per share |  |  | 1,387,254,551 | 1,426,810,939
Numerator: |  |  |  |
Net income (loss) attributable to Cheetah Mobile Inc. after accretion of redeemable noncontrolling interests | ¥ |  |  | ¥ (80,525) | ¥ 176,347
Net income (loss) attributable to ordinary shareholders | ¥ |  |  | ¥ (80,525) | ¥ 176,347
Earnings (Losses) per share - basic | ¥ / shares |  |  | ¥ (0.0580) | ¥ 0.1285
Denominator: |  |  |  |
Weighted average ordinary shares outstanding |  |  | 1,387,254,551 | 1,372,863,321
Dilutive effect of Restricted Shares |  |  |  | 21,284,316
Dilutive effect of restricted shares with an option feature |  |  |  | 32,663,302
Denominator used for earnings (losses) per share |  |  | 1,387,254,551 | 1,426,810,939
Earnings (losses) per share - diluted | ¥ / shares |  |  | ¥ (0.0580) | ¥ 0.1236
ADS |  |  |  |
Numerator: |  |  |  |
Weighted average ordinary shares outstanding |  |  | 138,725,455 | 137,286,332
Denominator: |  |  |  |
Weighted average number of ordinary shares outstanding |  |  | 138,725,455 | 137,286,332
Earnings (Losses) per share - basic | ¥ / shares |  |  | ¥ (0.5805) | ¥ 1.2845
Denominator used for earnings (losses) per share |  |  | 138,725,455 | 142,681,094
Numerator: |  |  |  |
Earnings (Losses) per share - basic | ¥ / shares |  |  | ¥ (0.5805) | ¥ 1.2845
Denominator: |  |  |  |
Weighted average ordinary shares outstanding |  |  | 138,725,455 | 137,286,332
Denominator used for earnings (losses) per share |  |  | 138,725,455 | 142,681,094
Earnings (losses) per share - diluted | ¥ / shares |  |  | ¥ (0.5805) | ¥ 1.2360
Common Class A [Member] |  |  |  |
Numerator: |  |  |  |
Net income (loss) attributable to Cheetah Mobile Inc. | 380,733 | 58,518 |  |
Accretion of redeemable noncontrolling interests | (3,799) | (584) |  |
Net income (loss) attributable to Cheetah Mobile Inc. after accretion of redeemable noncontrolling interests | ¥ 376,934 | $ 57,934 |  |
Weighted average ordinary shares outstanding | 393,753,299 | 393,753,299 | 368,910,885 | 314,229,617
Denominator: |  |  |  |
Weighted average number of ordinary shares outstanding | 393,753,299 | 393,753,299 | 368,910,885 | 314,229,617
Earnings (Losses) per share - basic | (per share) | ¥ 0.9573 | $ 0.1471 |  |
Denominator used for earnings (losses) per share | 1,425,154,838 | 1,425,154,838 | 1,387,254,551 | 1,426,810,939
Numerator: |  |  |  |
Net income (loss) attributable to Cheetah Mobile Inc. after accretion of redeemable noncontrolling interests | ¥ 376,934 | $ 57,934 |  |
Reallocation of net income as a result of conversion of Class B into Class A ordinary shares | 939,559 | 144,407 |  |
Net income (loss) attributable to ordinary shareholders | ¥ 1,334,743 | $ 205,146 |  |
Earnings (Losses) per share - basic | (per share) | ¥ 0.9573 | $ 0.1471 |  |
Denominator: |  |  |  |
Weighted average ordinary shares outstanding | 393,753,299 | 393,753,299 | 368,910,885 | 314,229,617
Dilutive effect of Restricted Shares | 909,584 | 909,584 |  |
Dilutive effect of restricted shares with an option feature | 27,289,001 | 27,289,001 |  |
Conversion of Class B into Class A ordinary shares | 1,003,202,954 | 1,003,202,954 |  |
Denominator used for earnings (losses) per share | 1,425,154,838 | 1,425,154,838 | 1,387,254,551 | 1,426,810,939
Earnings (losses) per share - diluted | (per share) | ¥ 0.9366 | $ 0.1439 |  |
Common Class A [Member] | ADS |  |  |  |
Numerator: |  |  |  |
Weighted average ordinary shares outstanding | 39,375,330 | 39,375,330 |  |
Denominator: |  |  |  |
Weighted average number of ordinary shares outstanding | 39,375,330 | 39,375,330 |  |
Earnings (Losses) per share - basic | (per share) | ¥ 9.5728 | $ 1.4713 |  |
Denominator used for earnings (losses) per share | 142,515,484 | 142,515,484 |  |
Numerator: |  |  |  |
Earnings (Losses) per share - basic | (per share) | ¥ 9.5728 | $ 1.4713 |  |
Denominator: |  |  |  |
Weighted average ordinary shares outstanding | 39,375,330 | 39,375,330 |  |
Denominator used for earnings (losses) per share | 142,515,484 | 142,515,484 |  |
Earnings (losses) per share - diluted | (per share) | ¥ 9.3656 | $ 1.4395 |  |
Common Class B [Member] |  |  |  |
Numerator: |  |  |  |
Net income (loss) attributable to Cheetah Mobile Inc. | ¥ 967,461 | $ 148,695 |  |
Accretion of redeemable noncontrolling interests | (9,652) | (1,483) |  |
Net income (loss) attributable to Cheetah Mobile Inc. after accretion of redeemable noncontrolling interests | ¥ 957,809 | $ 147,212 |  |
Weighted average ordinary shares outstanding | 1,000,550,027 | 1,000,550,027 | 1,018,343,666 | 1,058,633,704
Denominator: |  |  |  |
Weighted average number of ordinary shares outstanding | 1,000,550,027 | 1,000,550,027 | 1,018,343,666 | 1,058,633,704
Earnings (Losses) per share - basic | (per share) | ¥ 0.9573 | $ 0.1471 |  |
Denominator used for earnings (losses) per share | 1,003,202,954 | 1,003,202,954 | 1,018,343,666 | 1,079,059,263
Numerator: |  |  |  |
Net income (loss) attributable to Cheetah Mobile Inc. after accretion of redeemable noncontrolling interests | ¥ 957,809 | $ 147,212 |  |
Net income (loss) attributable to ordinary shareholders | ¥ 939,559 | $ 144,407 |  |
Earnings (Losses) per share - basic | (per share) | ¥ 0.9573 | $ 0.1471 |  |
Denominator: |  |  |  |
Weighted average ordinary shares outstanding | 1,000,550,027 | 1,000,550,027 | 1,018,343,666 | 1,058,633,704
Dilutive effect of Restricted Shares | 2,652,927 | 2,652,927 |  |
Denominator used for earnings (losses) per share | 1,003,202,954 | 1,003,202,954 | 1,018,343,666 | 1,079,059,263
Earnings (losses) per share - diluted | (per share) | ¥ 0.9366 | $ 0.1439 |  |

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