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Income Taxes - Additional Information (Detail)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2013
CNY
Dec. 31, 2013
High And New Technology Enterprise
Dec. 31, 2013
High And New Technology Enterprise
Expiration Period One
Dec. 31, 2013
High And New Technology Enterprise
Expiration Period Two
Dec. 31, 2013
High And New Technology Enterprise
Expiration Period Three
Dec. 31, 2013
Key Software Enterprise
Dec. 31, 2013
China
Dec. 31, 2013
China
Maximum
Dec. 31, 2013
China
Minimum
Dec. 31, 2013
Japan
Dec. 31, 2013
Japan
Maximum
Dec. 31, 2013
Japan
Minimum
Dec. 31, 2013
Baidu Japan
JPY (¥)
Dec. 31, 2013
Baidu Online
Key Software Enterprise
Income Taxes [Line Items]                              
Unified statutory income tax rate under current EIT law 25.00% 25.00%                          
Preferential enterprise income tax rate, effective period     3 years       2 years                
A preferential enterprise income tax rate     15.00%       10.00%                
Tax holiday, expiration date       Jan. 01, 2014 Jan. 01, 2015 Jan. 01, 2016                 Jan. 01, 2015
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% 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 365.89 2,220.00                          
Beginning expiration date of net operating loss               Jan. 01, 2017     Jan. 01, 2015        
Accrued withholding tax   580.72                          
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                 2013 2009   2013 2007