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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, 2012 Class A Ordinary Shares USD ($) | Dec. 31, 2012 Class A Ordinary Shares CNY | Dec. 31, 2011 Class A Ordinary Shares CNY | Dec. 31, 2010 Class A Ordinary Shares CNY | Dec. 31, 2012 Class A Ordinary Shares American Depositary Shares USD ($) | Dec. 31, 2012 Class A Ordinary Shares American Depositary Shares CNY | Dec. 31, 2011 Class A Ordinary Shares American Depositary Shares CNY | Dec. 31, 2010 Class A Ordinary Shares American Depositary Shares CNY | Dec. 31, 2012 Class B Ordinary Shares USD ($) | Dec. 31, 2012 Class B Ordinary Shares CNY | Dec. 31, 2011 Class B Ordinary Shares CNY | Dec. 31, 2010 Class B Ordinary Shares CNY
Earnings per ADS: |  |  |  |  |  |  |  |  |  |  |  |
Denominator used for earnings per ADS - basic | 27,145,208 | 27,145,208 | 27,086,098 | 26,566,454 | 271,452,080 | 271,452,080 | 270,860,980 | 265,664,540 | 7,794,630 | 7,794,630 | 7,803,952 | 8,238,907
Denominator used for earnings per ADS - diluted | 34,979,459 | 34,979,459 | 34,962,831 | 34,917,835 | 349,794,590 | 349,794,590 | 349,628,310 | 349,178,350 | 7,794,630 | 7,794,630 | 7,803,952 | 8,239,257
Earnings per ADS - basic | $ 47.93 | 298.62 | 190.27 | 101.28 | $ 4.79 | 29.86 | 19.03 | 10.13 | $ 47.93 | 298.62 | 190.27 | 101.28
Earnings per ADS - diluted | $ 47.88 | 298.29 | 189.88 | 100.96 | $ 4.79 | 29.83 | 18.99 | 10.10 | $ 47.88 | 298.29 | 189.88 | 100.96
Numerator |  |  |  |  |  |  |  |  |  |  |  |
Allocation of net income attributable to Baidu, Inc. | $ 1,301,138 | 8,106,219 | 5,153,755 | 2,690,712 |  |  |  |  | $ 373,616 | 2,327,666 | 1,484,882 | 834,456
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Weighted average ordinary shares outstanding | 27,145,208 | 27,145,208 | 27,086,098 | 26,566,454 |  |  |  |  | 7,794,630 | 7,794,630 | 7,803,952 | 8,238,907
Denominator used for earnings per share | 27,145,208 | 27,145,208 | 27,086,098 | 26,566,454 | 271,452,080 | 271,452,080 | 270,860,980 | 265,664,540 | 7,794,630 | 7,794,630 | 7,803,952 | 8,238,907
Earnings per share - basic | $ 47.93 | 298.62 | 190.27 | 101.28 | $ 4.79 | 29.86 | 19.03 | 10.13 | $ 47.93 | 298.62 | 190.27 | 101.28
Numerator |  |  |  |  |  |  |  |  |  |  |  |
Allocation of net income attributable to Baidu, Inc. for diluted computation | 1,301,561 | 8,108,856 | 5,156,846 | 2,693,365 |  |  |  |  | 373,193 | 2,325,029 | 1,481,791 | 831,803
Reallocation of net income attributable to Baidu, Inc. as a result of conversion of Class B to Class A shares | 373,193 | 2,325,029 | 1,481,791 | 831,803 |  |  |  |  |  |  |  |
Allocation of net income attributable to Baidu, Inc. | $ 1,674,754 | 10,433,885 | 6,638,637 | 3,525,168 |  |  |  |  | $ 373,193 | 2,325,029 | 1,481,791 | 831,803
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Weighted average ordinary shares outstanding | 27,145,208 | 27,145,208 | 27,086,098 | 26,566,454 | 271,452,080 | 271,452,080 | 270,860,980 | 265,664,540 | 7,794,630 | 7,794,630 | 7,803,952 | 8,238,907
Conversion of Class B to Class A ordinary shares | 7,794,630 | 7,794,630 | 7,803,952 | 8,238,907 |  |  |  |  |  |  |  |
Share-based awards | 39,621 | 39,621 | 72,781 | 112,474 |  |  |  |  |  |  |  | 350
Denominator used for earnings per share | 34,979,459 | 34,979,459 | 34,962,831 | 34,917,835 | 349,794,590 | 349,794,590 | 349,628,310 | 349,178,350 | 7,794,630 | 7,794,630 | 7,803,952 | 8,239,257
Earnings per share - diluted | $ 47.88 | 298.29 | 189.88 | 100.96 | $ 4.79 | 29.83 | 18.99 | 10.10 | $ 47.88 | 298.29 | 189.88 | 100.96

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