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Computation of Basic and Diluted Net Income Attribtable 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, 2011 USD ($) | Dec. 31, 2011 CNY | Dec. 31, 2010 CNY | Dec. 31, 2009 CNY | Dec. 31, 2011 Class A Ordinary Shares USD ($) | Dec. 31, 2011 Class A Ordinary Shares CNY | Dec. 31, 2010 Class A Ordinary Shares CNY | Dec. 31, 2009 Class A Ordinary Shares CNY | Dec. 31, 2011 Class A Ordinary Shares American Depositary Shares USD ($) | Dec. 31, 2011 Class A Ordinary Shares American Depositary Shares CNY | Dec. 31, 2010 Class A Ordinary Shares American Depositary Shares CNY | Dec. 31, 2009 Class A Ordinary Shares American Depositary Shares CNY | Dec. 31, 2011 Class B Ordinary Shares USD ($) | Dec. 31, 2011 Class B Ordinary Shares CNY | Dec. 31, 2010 Class B Ordinary Shares CNY | Dec. 31, 2009 Class B Ordinary Shares CNY
Earnings per ADS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominator used for earnings per share - basic |  |  |  |  | 27,086,098 | 27,086,098 | 26,566,454 | 25,773,592 | 270,860,980 | 270,860,980 | 265,664,540 | 257,735,920 | 7,803,952 | 7,803,952 | 8,238,907 | 8,797,198
Denominator used for earnings per share - diluted |  |  |  |  | 34,962,831 | 34,962,831 | 34,917,835 | 34,776,366 | 349,628,310 | 349,628,310 | 349,178,350 | 347,763,660 | 7,803,952 | 7,803,952 | 8,239,257 | 8,852,408
Earnings per share - basic |  |  |  |  | $ 30.23 | 190.27 | 101.28 | 42.96 | $ 3.02 | 19.03 | 10.13 | 4.30 | $ 30.23 | 190.27 | 101.28 | 42.96
Earnings per share - diluted |  |  |  |  | $ 30.17 | 189.88 | 100.96 | 42.70 | $ 3.02 | 18.99 | 10.10 | 4.27 | $ 30.17 | 189.88 | 100.96 | 42.70
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of net income attributable to Baidu, Inc. | $ 1,054,773 | 6,638,637 | 3,525,168 | 1,485,104 | $ 818,849 | 5,153,755 | 2,690,712 | 1,107,191 |  |  |  |  | $ 235,924 | 1,484,882 | 834,456 | 377,913
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average ordinary shares outstanding |  |  |  |  | 27,086,098 | 27,086,098 | 26,566,454 | 25,773,592 |  |  |  |  | 7,803,952 | 7,803,952 | 8,238,907 | 8,797,198
Denominator used for earnings per share - basic |  |  |  |  | 27,086,098 | 27,086,098 | 26,566,454 | 25,773,592 | 270,860,980 | 270,860,980 | 265,664,540 | 257,735,920 | 7,803,952 | 7,803,952 | 8,238,907 | 8,797,198
Earnings per share - basic |  |  |  |  | $ 30.23 | 190.27 | 101.28 | 42.96 | $ 3.02 | 19.03 | 10.13 | 4.30 | $ 30.23 | 190.27 | 101.28 | 42.96
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of net income attributable to Baidu, Inc. for diluted computation |  |  |  |  | 819,340 | 5,156,846 | 2,693,365 | 1,107,067 |  |  |  |  | 235,433 | 1,481,791 | 831,803 | 378,037
Reallocation of net income attributable to Baidu, Inc. as a result of conversion of Class B to Class A shares |  |  |  |  | 235,433 | 1,481,791 | 831,803 | 378,037 |  |  |  |  |  |  |  |
Allocation of net income attributable to Baidu, Inc. |  |  |  |  | $ 1,054,773 | 6,638,637 | 3,525,168 | 1,485,104 |  |  |  |  | $ 235,433 | 1,481,791 | 831,803 | 378,037
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominator used for earnings per share - basic |  |  |  |  | 27,086,098 | 27,086,098 | 26,566,454 | 25,773,592 | 270,860,980 | 270,860,980 | 265,664,540 | 257,735,920 | 7,803,952 | 7,803,952 | 8,238,907 | 8,797,198
Conversion of Class B to Class A ordinary shares |  |  |  |  | 7,803,952 | 7,803,952 | 8,238,907 | 8,797,198 |  |  |  |  |  |  |  |
Share-based awards |  |  |  |  | 72,781 | 72,781 | 112,474 | 205,576 |  |  |  |  |  |  | 350 | 55,210
Denominator used for earnings per share - diluted |  |  |  |  | 34,962,831 | 34,962,831 | 34,917,835 | 34,776,366 | 349,628,310 | 349,628,310 | 349,178,350 | 347,763,660 | 7,803,952 | 7,803,952 | 8,239,257 | 8,852,408
Earnings per share - diluted |  |  |  |  | $ 30.17 | 189.88 | 100.96 | 42.70 | $ 3.02 | 18.99 | 10.10 | 4.27 | $ 30.17 | 189.88 | 100.96 | 42.70

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