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Summary of Redeemable Noncontrolling Interest (Detail) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2014 CNY | Dec. 31, 2013 CNY | Dec. 31, 2012 CNY
Temporary Equity Disclosure [Abstract] |  |  |  |  |  |
Balance as of January 1 | $ 0 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount |  | 0 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount |  | 1,033,283 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount | 935,978 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
Business combination | 0 bidu_TemporaryEquityRedeemableNoncontrollingInterestIncreaseFromBusinessCombination |  | 0 bidu_TemporaryEquityRedeemableNoncontrollingInterestIncreaseFromBusinessCombination |  | 0 bidu_TemporaryEquityRedeemableNoncontrollingInterestIncreaseFromBusinessCombination | 100,101 bidu_TemporaryEquityRedeemableNoncontrollingInterestIncreaseFromBusinessCombination
Net losses | 0 us-gaap_TemporaryEquityNetIncome |  | 0 us-gaap_TemporaryEquityNetIncome |  | (61,857)us-gaap_TemporaryEquityNetIncome | (55,804)us-gaap_TemporaryEquityNetIncome
Other comprehensive losses | 0 us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments |  | 0 us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments |  | (55,420)us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments | (690)us-gaap_TemporaryEquityForeignCurrencyTranslationAdjustments
Exercise of share-based awards | 0 us-gaap_TemporaryEquityOtherChanges |  | 0 us-gaap_TemporaryEquityOtherChanges |  | 464 us-gaap_TemporaryEquityOtherChanges | 0 us-gaap_TemporaryEquityOtherChanges
Share-based compensation | 0 bidu_TemporaryEquitySharebasedCompensation |  | 0 bidu_TemporaryEquitySharebasedCompensation |  | 11,259 bidu_TemporaryEquitySharebasedCompensation | 5,566 bidu_TemporaryEquitySharebasedCompensation
Issuance of subsidiary shares | 296,845 bidu_TemporaryEquityEquityIssuanceOfSubsidiaries | [1] | 1,841,819 bidu_TemporaryEquityEquityIssuanceOfSubsidiaries | [1] | 51,368 bidu_TemporaryEquityEquityIssuanceOfSubsidiaries | 25,989 bidu_TemporaryEquityEquityIssuanceOfSubsidiaries
Accretion of redeemable noncontrolling interests | 8,493 us-gaap_TemporaryEquityAccretionToRedemptionValue | [1] | 52,683 us-gaap_TemporaryEquityAccretionToRedemptionValue | [1] | 31,799 us-gaap_TemporaryEquityAccretionToRedemptionValue | 22,143 us-gaap_TemporaryEquityAccretionToRedemptionValue
Acquisition of subsidiaries' redeemable shares from noncontrolling shareholders | 0 bidu_RedeemableNoncontrollingInterestsDecreaseFromRedemptions |  | 0 bidu_RedeemableNoncontrollingInterestsDecreaseFromRedemptions |  | (121,962)bidu_RedeemableNoncontrollingInterestsDecreaseFromRedemptions | 0 bidu_RedeemableNoncontrollingInterestsDecreaseFromRedemptions
Reclassification of redeemable noncontrolling interests | 0 bidu_TemporaryEquityReclassificationsOfTemporaryToPermanentEquity |  | 0 bidu_TemporaryEquityReclassificationsOfTemporaryToPermanentEquity |  | (888,934)bidu_TemporaryEquityReclassificationsOfTemporaryToPermanentEquity | 0 bidu_TemporaryEquityReclassificationsOfTemporaryToPermanentEquity
Balance as of December 31 | $ 305,338 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount |  | 1,894,502 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount |  | 0 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount | 1,033,283 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
[1] | On November 14, 2014, Qiyi completed a round of preferred shares financing. The new preferred shareholders acquired 13.42% of the then outstanding equity interest of Qiyi for a total consideration of US$300 million. The newly issued preferred shares could be redeemed by such shareholders upon the occurrence of certain events that are not solely within the control of Qiyi and are accounted for as redeemable noncontrolling interests. The Company accounts for the accrete changes in the redemption value in accordance with ASC topic 480 ("ASC 480"), Distinguishing Liabilities from Equity. The Company elects to use the effective interest method for the changes of redemption value over the period from the date of issuance to the earliest redemption date of the noncontrolling interest.

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- Definition Amount of decrease in Redeemable Noncontrolling Interests from redeeming or purchasing the interests of redeemable noncontrolling shareholders. + References No definition available. + Details
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- Definition Change of temporary equity due to equity issuance of subsidiaries. + References No definition available. + Details
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- Definition Change of temporary equity during the period due to the reclassification of temporary equity to permanent equity since the redemption rights of the equity instruments are terminated. + References No definition available. + Details
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- Definition Increase in redeemable noncontrolling interest balance because of a business combination that occurred during the period. + References No definition available. + Details
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- Definition Change of temporary equity during the period due to the recognized amount of share-based compensation. + References No definition available. + Details
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- Definition As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 + Details
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- Definition Value of accretion of temporary equity to its redemption value during the period. + References No definition available. + Details
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- Details
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- Definition Adjustments to temporary equity resulting from foreign currency translation adjustments. + References No definition available. + Details
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- Definition The portion of net income or loss attributable to temporary equity interest. + References No definition available. + Details
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- Definition This element may be used to disclose other activity associated with temporary equity that is not separately disclosed. + References No definition available. + Details
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