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Pro Forma Consolidated Statements of Comprehensive Income (Detail) (Qunar) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 USD ($) | Dec. 31, 2011 CNY | Dec. 31, 2010 CNY
Business Acquisition, Pro Forma Information [Line Items] |  |  |
Revenue | $ 2,346,165 | 14,766,530 | 8,039,726
Net income attributable to Baidu, Inc. | $ 1,039,721 | 6,543,899 | 3,466,089

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