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Share Based Award Plan - Additional Information of Baidu, Inc. (Detail) - Parent Company $ / shares in Units, ¥ in Thousands, $ in Thousands | 12 Months Ended |
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Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2014 $ / shares | Dec. 31, 2013 CNY (¥) | Dec. 31, 2013 $ / shares | Dec. 31, 2015 CNY (¥) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of voting power | 10.00% | 10.00% |  |  |  |  |
The weighted-average grant-date fair value of restricted shares granted during respective years | $ 1,979.30 |  |  |  |  |  |
2008 Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized for issuance | shares | 3,428,777 |  |  |  |  |  | 3,428,777
Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total intrinsic value of options exercised | $ 30,860 | ¥ 199,880 | ¥ 224,800 |  | ¥ 114,210 |  |
Total fair value of options vested | 23,000 | ¥ 149,000 | 149,220 |  | 123,440 |  |
Unrecognized share-based compensation cost | $ 53,880 |  |  |  |  |  | ¥ 349,030
A weighted-average vesting period over which the deferred cost is expected to be recognized | 2 years 7 months 17 days | 2 years 7 months 17 days |  |  |  |  |
The weighted-average grant-date fair value of options granted during respective years | $ 790.00 |  |  | $ 755.00 |  | $ 419.80 |
Stock Options | 2008 Plan | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares vesting term | 2 years | 2 years |  |  |  |  |
Stock Options | 2008 Plan | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares vesting term | 4 years | 4 years |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized share-based compensation cost | $ 365,950 |  |  |  |  |  | ¥ 2,370,000
A weighted-average vesting period over which the deferred cost is expected to be recognized | 3 years 1 month 17 days | 3 years 1 month 17 days |  |  |  |  |
Total fair value of shares vested during respective years, restricted shares | $ 108,160 | ¥ 700,660 | ¥ 324,410 |  | ¥ 247,240 |  |
The weighted-average grant-date fair value of restricted shares granted during respective years | $ 1,979.30 |  |  | $ 1,815.60 |  | $ 1,137.00 |
Restricted Stock | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares vesting term | 2 years | 2 years |  |  |  |  |
Restricted Stock | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares vesting term | 4 years | 4 years |  |  |  |  |
Employee Holding No More Than Ten Percent Voting Power | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Contractual term of share-based awards granted | 10 years | 10 years |  |  |  |  |
Employee Holding More Than Ten Percent Voting Power | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Contractual term of share-based awards granted | 5 years | 5 years |  |  |  |  |
Employee Holding More Than Ten Percent Voting Power | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of the fair market value of the entity's ordinary shares | 110.00% |  |  |  |  |  | 110.00%

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- Definition The minimum percentage of voting power held by an employee whose granted incentive share option's term are subject to a maximum of five years, and the exercise price cannot be less than 110% of the fair market value of the company's ordinary shares on the date of that grant. + References No definition available. + 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 Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 + 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 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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