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Computation of Basic and Diluted Net Income Attributable to Baidu, Inc. Per Share for Class A and Class B Ordinary Shares (Detail) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 USD ($) | Dec. 31, 2013 CNY | Dec. 31, 2012 CNY | Dec. 31, 2011 CNY | Dec. 31, 2013 Class A Ordinary Shares USD ($) | Dec. 31, 2013 Class A Ordinary Shares CNY | Dec. 31, 2012 Class A Ordinary Shares CNY | Dec. 31, 2011 Class A Ordinary Shares CNY | Dec. 31, 2013 Class A Ordinary Shares American Depositary Shares USD ($) | Dec. 31, 2013 Class A Ordinary Shares American Depositary Shares CNY | Dec. 31, 2012 Class A Ordinary Shares American Depositary Shares CNY | Dec. 31, 2011 Class A Ordinary Shares American Depositary Shares CNY | Dec. 31, 2013 Class B Ordinary Shares USD ($) | Dec. 31, 2013 Class B Ordinary Shares CNY | Dec. 31, 2012 Class B Ordinary Shares CNY | Dec. 31, 2011 Class B Ordinary Shares CNY
Earnings per ADS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominator used for earnings per ADS - basic |  |  |  |  | 27,274,769 | 27,274,769 | 27,145,208 | 27,086,098 | 272,747,690 | 272,747,690 | 271,452,080 | 270,860,980 | 7,711,459 | 7,711,459 | 7,794,630 | 7,803,952
Denominator used for earnings per ADS -diluted |  |  |  |  | 35,036,346 | 35,036,346 | 34,979,459 | 34,962,831 | 350,363,460 | 350,363,460 | 349,794,590 | 349,628,310 | 7,711,459 | 7,711,459 | 7,794,630 | 7,803,952
Earnings per ADS - basic |  |  |  |  | $ 49.52 | 299.75 | 298.62 | 190.27 | $ 4.95 | 29.98 | 29.86 | 19.03 | $ 49.52 | 299.75 | 298.62 | 190.27
Earnings per ADS - diluted |  |  |  |  | $ 49.44 | 299.32 | 298.29 | 189.88 | $ 4.94 | 29.93 | 29.83 | 18.99 | $ 49.44 | 299.32 | 298.29 | 189.88
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of net income attributable to Baidu, Inc. | $ 1,732,356 | 10,487,167 | 10,433,885 | 6,638,637 | $ 1,350,520 | 8,175,647 | 8,106,219 | 5,153,755 |  |  |  |  | $ 381,836 | 2,311,520 | 2,327,666 | 1,484,882
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average ordinary shares outstanding |  |  |  |  | 27,274,769 | 27,274,769 | 27,145,208 | 27,086,098 | 272,747,690 | 272,747,690 | 271,452,080 | 270,860,980 | 7,711,459 | 7,711,459 | 7,794,630 | 7,803,952
Denominator used for earnings per share |  |  |  |  | 27,274,769 | 27,274,769 | 27,145,208 | 27,086,098 | 272,747,690 | 272,747,690 | 271,452,080 | 270,860,980 | 7,711,459 | 7,711,459 | 7,794,630 | 7,803,952
Earnings per share - basic |  |  |  |  | $ 49.52 | 299.75 | 298.62 | 190.27 | $ 4.95 | 29.98 | 29.86 | 19.03 | $ 49.52 | 299.75 | 298.62 | 190.27
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of net income attributable to Baidu, Inc. for diluted computation |  |  |  |  | 1,351,066 | 8,178,954 | 8,108,856 | 5,156,846 |  |  |  |  | 381,290 | 2,308,213 | 2,325,029 | 1,481,791
Reallocation of net income attributable to Baidu, Inc. as a result of conversion of Class B to Class A shares |  |  |  |  | 381,290 | 2,308,213 | 2,325,029 | 1,481,791 |  |  |  |  |  |  |  |
Allocation of net income attributable to Baidu, Inc. |  |  |  |  | $ 1,732,356 | 10,487,167 | 10,433,885 | 6,638,637 |  |  |  |  | $ 381,290 | 2,308,213 | 2,325,029 | 1,481,791
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average ordinary shares outstanding |  |  |  |  | 27,274,769 | 27,274,769 | 27,145,208 | 27,086,098 | 272,747,690 | 272,747,690 | 271,452,080 | 270,860,980 | 7,711,459 | 7,711,459 | 7,794,630 | 7,803,952
Conversion of Class B to Class A ordinary shares |  |  |  |  | 7,711,459 | 7,711,459 | 7,794,630 | 7,803,952 |  |  |  |  |  |  |  |
Share-based awards |  |  |  |  | 50,118 | 50,118 | 39,621 | 72,781 |  |  |  |  |  |  |  |
Denominator used for earnings per share |  |  |  |  | 35,036,346 | 35,036,346 | 34,979,459 | 34,962,831 | 350,363,460 | 350,363,460 | 349,794,590 | 349,628,310 | 7,711,459 | 7,711,459 | 7,794,630 | 7,803,952
Earnings per share - diluted |  |  |  |  | $ 49.44 | 299.32 | 298.29 | 189.88 | $ 4.94 | 29.93 | 29.83 | 18.99 | $ 49.44 | 299.32 | 298.29 | 189.88

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