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Income Taxes - Additional Information (Detail) ¥ in Thousands, $ in Thousands, ¥ in Millions | 3 Months Ended | 12 Months Ended | 21 Months Ended | 36 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 | Dec. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 JPY (¥) | Dec. 31, 2013 CNY (¥)
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Effective tax rate |  | 20.08% | 14.44% | 15.41% |  |  |  |  |
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 |  | $ 2,380,000 |  |  | $ 2,380,000 | $ 2,380,000 | ¥ 16,500,000 |  |
Accrued withholding tax |  | 91,151 | ¥ 592,719 |  | 91,151 | 91,151 | 632,859 |  | ¥ 580,720
Undistributed earnings no withholding tax has accrued |  | $ 12,890,000 |  |  | $ 12,890,000 | $ 12,890,000 | ¥ 89,520,000 |  |
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% |  |  |  |  |  |  |
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 | Maximum |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Effective tax rate |  | 37.00% |  |  |  |  |  |  |
Baidu Japan | Minimum |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Effective tax rate |  | 34.00% |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
A preferential enterprise income tax rate |  |  |  | 10.00% |  |  |  |  |
Baidu Online | Key Software Enterprise |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
A preferential enterprise income tax rate |  |  | 10.00% |  |  |  |  |  |
Baidu China | 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 |  | 2017 |  |  |  |  |  |  |
Certain PRC Subsidiaries and VIEs | Expiration Period Two | High And New Technology Enterprise |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Tax holiday, expiration year |  | 2018 |  |  |  |  |  |  |
Certain PRC Subsidiaries and VIEs | Expiration Period Three | High And New Technology Enterprise |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Tax holiday, expiration year |  | 2019 |  |  |  |  |  |  |
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 |  | 2012 |  |  |  |  |  |  |
PRC | Latest Tax Year |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Tax years remain open to examination by respective taxing jurisdictions |  | 2016 |  |  |  |  |  |  |
Japan |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Net operating loss carryforward period |  | 9 years |  |  |  |  |  |  |
Net operating loss carryforwards begins to expire |  | 2018 |  |  |  |  |  |  |

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