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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, 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