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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
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%