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Summary of Significant Accounting Policies (Cash and Cash Equivalents and Short Term Investment) - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2012
Cash and cash equivalents | Maximum |
Summary Of Significant Accounting Policies [Line Items] |
Maturity period used to classify investments | 3 months
Short-term Investments |
Summary Of Significant Accounting Policies [Line Items] |
Period which investments to be reclassified to short term investment from long term investment | 12 months
Short-term Investments | Maximum |
Summary Of Significant Accounting Policies [Line Items] |
Maturity period used to classify investments | 12 months
Short-term Investments | Minimum |
Summary Of Significant Accounting Policies [Line Items] |
Maturity period used to classify investments | 3 months

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- Definition Original maturity used to classify investments. + References No definition available. + Details
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Namespace Prefix: | bidu_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Period which investments to be reclassified to short term investment from long term investment. + References No definition available. + Details
Name: | bidu_PeriodWhichInvestmentsToBeReclassifiedToShortTermInvestmentFromLongTermInvestment
Namespace Prefix: | bidu_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | bidu_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | bidu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration