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Share Based Award Plan - Additional Information (Detail) (Baidu, Inc.) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2012 2000 Plan | Dec. 31, 2012 Share Option Under 2000 Plan | Dec. 31, 2012 2008 Plan | Dec. 31, 2012 Share Option Except ISO to More Than Ten Percent Voting Power Employee Under 2008 Plan Y | Dec. 31, 2012 ISO to More Than Ten Percent Voting Power Employee Under 2008 Plan Maximum Y | Dec. 31, 2012 ISO to More Than Ten Percent Voting Power Employee Under 2008 Plan Minimum | Dec. 31, 2012 Restricted Stock USD ($) | Dec. 31, 2012 Restricted Stock CNY | Dec. 31, 2011 Restricted Stock CNY | Dec. 31, 2010 Restricted Stock CNY | Dec. 31, 2012 Restricted Stock Maximum | Dec. 31, 2012 Restricted Stock Minimum | Dec. 31, 2012 Stock Options USD ($) | Dec. 31, 2012 Stock Options CNY | Dec. 31, 2011 Stock Options USD ($) | Dec. 31, 2011 Stock Options CNY | Dec. 31, 2010 Stock Options USD ($) | Dec. 31, 2010 Stock Options CNY
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserved ordinary shares for issuance under share-based awards plan |  | 5,040,000 |  | 3,428,777 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of share-based awards granted generally vest after the first year of service |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining vesting period |  |  | 36 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum contractual term of share-based awards granted |  |  |  |  | 10 | 5 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting power | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of the fair market value of the entity's ordinary shares |  |  |  |  |  |  | 110.00% |  |  |  |  |  |  |  |  |  |  |  |
Shares vesting term (in years) |  |  |  |  |  |  |  |  |  |  |  | 4 years | 2 years |  |  |  |  |  |
Total intrinsic value of options exercised |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 32.25 | 200.91 |  | 275.86 |  | 263.97
Unrecognized share-based compensation cost |  |  |  |  |  |  |  | 102.81 | 640.50 |  |  |  |  | 50.97 | 317.54 |  |  |  |
A weighted-average vesting period over which the deferred cost is expected to be recognized (in years) |  |  |  |  |  |  |  | 3 years 22 days | 3 years 22 days |  |  |  |  | 3 years 7 months 2 days | 3 years 7 months 2 days |  |  |  |
The weighted-average grant-date fair value of options granted during respective years |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 323.00 |  | $ 432.68 |  | $ 279.69 |
Total fair value of shares vested during respective years, restricted shares |  |  |  |  |  |  |  | $ 20.66 | 128.70 | 198.77 | 237.71 |  |  |  |  |  |  |  |

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- Definition Percentage of share-based awards granted generally vest after the first year of service. + References No definition available. + Details
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- Definition As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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