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Organization, Consolidation and Presentation of Financial Statements - Additional Information (Detail) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2012 CNY	Dec. 31, 2012 Baidu Netcom CNY	Dec. 31, 2012 Beijing Perusal CNY	Dec. 31, 2012 Beijing Perusal License Agreements Excluding Software License Agreement	Dec. 31, 2012 Baidu Pay CNY	Dec. 31, 2012 Baidu Pay License Agreements Excluding Software License Agreement	Dec. 31, 2012 Baidu HR CNY
Variable Interest Entity [Line Items]
Interest-free loans provided by a subsidiary of the entity to the shareholders of its variable interest entities			100.0	10.0		9.0		50.0
Term of License Agreements excluding software license agreement					5 years		5 years
Agreements, automatic extension period					1 year		1 year
Equity pledge agreement expiration period			2 years	2 years		2 years		2 years
Net assets of VIEs (in which the Company has no legal ownership)	$ 98.29	612.34
Exchange rate used for conversion of financial statements from RMB to US dollar	6.2301	6.2301

X

- Definition

The automatic extension period for the entity's agreements at their expiration.

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- Definition

Translation rate of amounts from RMB into US$ for the convenience of the reader have been calculated at the exchange rate on the last date of calendar year-end reporting period as published on the website of the Federal Reserve Board. No representation is made that the RMB amounts could have been, or could be, converted into U.S. dollars at such rate.

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X

- Definition

The period after which the equity pledge agreement between the shareholders of the entity's VIE and the entity's subsidiary will expire after expiration of the term or the fulfillment by the entity's VIE and its shareholders of their respective obligations under the exclusive technology consulting and service agreement and the loan agreement.

+ References

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- Definition

The amount of interest-free loans provided by a subsidiary of the entity to the shareholders of the variable interest entities controlled by the entity.

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X

- Definition

The term of each of the entity's License Agreements excluding software license agreement from execution date of each agreement.

+ References

No definition available.

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- Definition

The net carrying amount of the consolidated Variable Interest Entity's assets and liabilities included in the reporting entity's statement of financial position.

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