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SEGMENT REPORTING - Additional Information (Detail) | Dec. 31, 2011
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Segment Reporting Information [Line Items] |
Number of operating segment | 1

X
- Definition The number of operating segment the entity has. + References No definition available. + Details
Name: | bidu_NumberOfOperatingSegment
Namespace Prefix: | bidu_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration