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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
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