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Summary of Estimated Fair Values of Assets Acquired, Liabilities Assumed and Noncontrolling Interest (Detail) In Thousands, unless otherwise specified | Dec. 31, 2014 USD ($) | Dec. 31, 2014 CNY | Dec. 31, 2013 USD ($) | Dec. 31, 2013 CNY | Dec. 31, 2012 CNY | Dec. 31, 2011 CNY | Dec. 31, 2014 Business Acquisitions 2014 USD ($) | Dec. 31, 2014 Business Acquisitions 2014 CNY | Dec. 31, 2012 Business Acquisitions 2012 CNY | Dec. 31, 2013 Series of Individually Immaterial Business Acquisitions CNY | Oct. 01, 2013 Acquisition of 91 Wireless 2013 CNY
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Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business combination, purchase consideration |  |  |  |  |  |  | $ 64,212 bidu_BusinessCombinationPurchaseConsiderationBasePurchasePrice / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyFourteenMember | 398,410 bidu_BusinessCombinationPurchaseConsiderationBasePurchasePrice / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyFourteenMember | 1,190,717 bidu_BusinessCombinationPurchaseConsiderationBasePurchasePrice / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyTwelveMember | 3,865,378 bidu_BusinessCombinationPurchaseConsiderationBasePurchasePrice / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember | 11,196,235 bidu_BusinessCombinationPurchaseConsiderationBasePurchasePrice / us-gaap_BusinessAcquisitionAxis = bidu_NinetyOneWirelessMember
Net assets acquired, excluding intangible assets and the related deferred tax liabilities |  |  |  |  |  |  | (15,466)bidu_BusinessAcquisitionPurchasePriceAllocationNetAssetsAcquiredExcludingIntangibleAssetsAndRelatedDeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyFourteenMember | (95,961)bidu_BusinessAcquisitionPurchasePriceAllocationNetAssetsAcquiredExcludingIntangibleAssetsAndRelatedDeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyFourteenMember | 91,095 bidu_BusinessAcquisitionPurchasePriceAllocationNetAssetsAcquiredExcludingIntangibleAssetsAndRelatedDeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyTwelveMember | 467,159 bidu_BusinessAcquisitionPurchasePriceAllocationNetAssetsAcquiredExcludingIntangibleAssetsAndRelatedDeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember | 483,341 bidu_BusinessAcquisitionPurchasePriceAllocationNetAssetsAcquiredExcludingIntangibleAssetsAndRelatedDeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = bidu_NinetyOneWirelessMember
Intangible assets, net |  |  |  |  |  |  | 40,204 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyFourteenMember | 249,452 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyFourteenMember | 664,380 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyTwelveMember | 796,415 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember | 1,146,300 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = bidu_NinetyOneWirelessMember
Deferred tax liabilities, noncurrent |  |  |  |  |  |  | (10,951)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyFourteenMember | (67,945)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyFourteenMember | (72,222)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyTwelveMember | (112,233)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember | (278,346)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = bidu_NinetyOneWirelessMember
Noncontrolling interests |  |  |  |  |  |  | (24,175)us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyFourteenMember | (150,000)us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyFourteenMember | (32,507)us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyTwelveMember | (427,813)us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember |
Redeemable noncontrolling interests |  |  |  |  |  |  |  |  | (100,101)bidu_BusinessCombinationAcquisitionOfLessThanOneHundredPercentRedeemableNoncontrollingInterestFairValue / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyTwelveMember |  |
Pre-existing equity interests |  |  |  |  |  |  | (14,776)bidu_BusinessCombinationsStepAcquisitionEquityInterestInAcquireeFairValue / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyFourteenMember | (91,677)bidu_BusinessCombinationsStepAcquisitionEquityInterestInAcquireeFairValue / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyFourteenMember | (817,951)bidu_BusinessCombinationsStepAcquisitionEquityInterestInAcquireeFairValue / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyTwelveMember |  |
Goodwill | $ 2,807,416 us-gaap_Goodwill | 17,418,895 us-gaap_Goodwill | $ 2,718,040 us-gaap_Goodwill | 16,864,350 us-gaap_Goodwill | 3,877,564 us-gaap_Goodwill | 2,419,542 us-gaap_Goodwill | $ 89,376 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyFourteenMember | 554,541 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyFourteenMember | 1,458,023 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = bidu_BusinessAcquisitionsTwentyTwelveMember | 3,141,850 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember | 9,844,940 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = bidu_NinetyOneWirelessMember

X
- Definition The amount of acquisition cost of a business combination allocated to assets acquired (excluding identifiable intangible assets and the related deferred tax liabilities) less liabilities assumed. + References No definition available. + Details
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- Definition This element represents the fair value of redeemable noncontrolling interest in the acquiree at the acquisition date. + References No definition available. + Details
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- Definition Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination. + References No definition available. + Details
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- Definition This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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