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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
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