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Restricted Shares Activity (Detail) (Baidu, Inc., USD $)
12 Months Ended
Dec. 31, 2011
Baidu, Inc.
 
Number of Shares - Unvested  
Unvested, December 31, 2010 49,617
Granted 40,558
Vested (27,115)
Forfeited (6,838)
Unvested, December 31, 2011 56,222
Weighted Average Grant Date Fair Value  
Unvested, December 31, 2010 $ 643.22
Granted $ 1,372.90
Vested $ 535.64
Forfeited $ 972.08
Unvested, December 31, 2011 $ 1,181.49