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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
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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 |  |  |  |  |  |  |  |  |  |

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