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Income Taxes - Additional Information (Detail)
In Millions, unless otherwise specified
 12 Months Ended 36 Months Ended 12 Months Ended 24 Months Ended 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2012
CNY
Dec. 31, 2012
Domestic Country
Dec. 31, 2012
Domestic Country
Maximum
Dec. 31, 2012
Domestic Country
Minimum
Dec. 31, 2012
Foreign Country
Dec. 31, 2012
Foreign Country
Maximum
Dec. 31, 2012
Foreign Country
Minimum
Dec. 31, 2012
Qualified HNTE Since 2008
Dec. 31, 2010
Key Software Enterprise
Dec. 31, 2012
Qualified HNTE Since 2010
Dec. 31, 2012
Baidu HK
Dec. 31, 2012
Baidu, Inc.
Dec. 31, 2012
Baidu Japan
JPY (¥)
Dec. 31, 2011
Baidu Times
Dec. 31, 2012
Baidu China
Dec. 31, 2011
Baidu China
Dec. 31, 2010
Baidu China
Income Taxes [Line Items]                                    
Unified statutory income tax rate under current EIT law 25.00% 25.00%                     25.00%          
A preferential enterprise income tax rate                 15.00%   15.00%         15.00% 24.00%  
A preferential enterprise income tax rate granted                   10.00%                
Reduction rate on applicable enterprise income tax rates                             50.00%     50.00%
Statutory withholding tax rate to which dividends paid by a FIE to any of its foreign non-resident enterprise investors are subject 10.00% 10.00%                                
Special withholding tax rate to which dividends paid by a FIE to its foreign non-resident enterprise investors of certain jurisdictions are subject                       5.00%            
Minimum paid-in capital required for a specified Japan national income tax rate                           ¥ 100.00        
A specified Japan national income tax rate                           30.00%        
Operating loss carry forwards $ 176.69 1,100.00                                
Beginning expiration year of net operating loss     2017     2015                        
Time period that tax authorities could conduct examinations of entity's tax filings       5 years     7 years                      
Tax years remain open to examination by respective taxing jurisdictions       2012 2008   2012 2007