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Business Combinations - Additional Information (Detail) (Acquisition of 91 Wireless 2013, USD $) | 0 Months Ended |
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Oct. 01, 2013 | Oct. 01, 2013
Acquisition of 91 Wireless 2013 |  |
Business Acquisition [Line Items] |  |
Business combination, percentage of voting interests acquired | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = bidu_NinetyOneWirelessMember | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = bidu_NinetyOneWirelessMember
Business combination, cash paid upon acquisition | $ 1,830,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bidu_NinetyOneWirelessMember |
Business combination, amount deposited in an escrow account | $ 10,000,000 us-gaap_EscrowDeposit / us-gaap_BusinessAcquisitionAxis = bidu_NinetyOneWirelessMember | $ 10,000,000 us-gaap_EscrowDeposit / us-gaap_BusinessAcquisitionAxis = bidu_NinetyOneWirelessMember
Business combination, escrow period | 18 months |

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- Definition The period in which the escrowed amount reserved will be released to pay for liabilities resulting from any breach of the representations and warranties made upon the acquisition or indemnifiable loss incurred, if any, and the period after which any remaining amount will be released and transferred to acquiree's original selling shareholders. + References No definition available. + Details
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- Details
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Period Type: | duration

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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Balance Type: | na
Period Type: | instant

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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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