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Income Taxes - Additional Information (Detail) ¥ in Thousands, $ in Thousands, ¥ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2015 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2013 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2015 JPY (¥)
Income Taxes [Line Items] |  |  |  |  |  |  |
Effective tax rate |  |  | 14.44% | 15.41% | 15.01% |  |
Unified statutory income tax rate under current EIT law |  |  | 25.00% |  |  |  |
Statutory withholding tax rate to which dividends paid by a FIE to any of its foreign non-resident enterprise investors are subject |  |  | 10.00% |  |  |  |
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% |  |  |  |
Statutory withholding tax rate for capital gains |  |  | 10.00% |  |  |  |
Operating loss carry forwards |  | $ 1,240,000 | $ 1,240,000 |  |  | ¥ 8,050,000 |
Accrued withholding tax |  | 91,500 | 91,500 | ¥ 594,336 | ¥ 580,720 | 592,719 |
Undistributed earnings no withholding tax has accrued |  | $ 10,830,000 | $ 10,830,000 |  |  | ¥ 70,130,000 |
High And New Technology Enterprise |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
A preferential enterprise income tax rate |  |  | 15.00% |  |  |  |
Preferential enterprise income tax rate, effective period |  |  | 3 years |  |  |  |
Key Software Enterprise |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
A preferential enterprise income tax rate |  |  | 10.00% |  |  |  |
Preferential enterprise income tax rate, effective period |  |  | 2 years |  |  |  |
Baidu HK |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Income Tax Rate |  |  | 16.50% |  |  |  |
Baidu Japan |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Minimum paid-in capital required for a specified Japan national income tax rate |  |  |  |  |  |  | ¥ 100
Maximum paid-in capital required for a specified Japan national income tax rate |  |  |  |  |  |  | ¥ 100
Baidu Japan | Minimum |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Effective tax rate |  |  | 34.00% |  |  |  |
Baidu Japan | Maximum |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Effective tax rate |  |  | 37.00% |  |  |  |
Baidu Japan | Up to March 31, 2015 for paid-in capital in excess of JPY100 million |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
A specified Japan national income tax rate | 25.50% |  |  |  |  |  |
Baidu Japan | From April 1, 2015 for paid-in capital in excess of JPY100 million |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
A specified Japan national income tax rate |  | 23.90% |  |  |  |  |
Baidu Japan | From April 1, 2015 on first JPY8 million for paid-in capital equals JPY100 million or less |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
A specified Japan national income tax rate |  | 15.00% |  |  |  |  |
Baidu Japan | From April 1, 2015 on the portion over JPY8 million for paid-in capital equals JPY100 million or less |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
A specified Japan national income tax rate |  | 23.90% |  |  |  |  |
Baidu Online | High And New Technology Enterprise |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
A preferential enterprise income tax rate |  |  | 15.00% |  |  |  |
Baidu Online | Key Software Enterprise |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
A preferential enterprise income tax rate |  |  |  | 10.00% |  |  |
Certain PRC Subsidiaries and VIEs | High And New Technology Enterprise |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
A preferential enterprise income tax rate |  |  | 15.00% |  |  |  |
Certain PRC Subsidiaries and VIEs | Expiration Period One | High And New Technology Enterprise |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Tax holiday, expiration year |  |  | 2016 |  |  |  |
Certain PRC Subsidiaries and VIEs | Expiration Period Two | High And New Technology Enterprise |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Tax holiday, expiration year |  |  | 2017 |  |  |  |
Certain PRC Subsidiaries and VIEs | Expiration Period Three | High And New Technology Enterprise |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Tax holiday, expiration year |  |  | 2018 |  |  |  |
PRC |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Net operating loss carryforward period |  |  | 5 years |  |  |  |
Net operating loss carryforwards begins to expire |  |  | 2018 |  |  |  |
PRC | Maximum |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Time period that tax authorities could conduct examinations of entity's tax filings |  |  | 5 years |  |  |  |
PRC | Earliest Tax Year |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Tax years remain open to examination by respective taxing jurisdictions |  |  | 2011 |  |  |  |
PRC | Latest Tax Year |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Tax years remain open to examination by respective taxing jurisdictions |  |  | 2015 |  |  |  |
Japan |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Net operating loss carryforward period |  |  | 9 years |  |  |  |
Net operating loss carryforwards begins to expire |  |  | 2018 |  |  |  |

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