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Investments - Short-term Investments - Additional information (Detail) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 USD ($) | Dec. 31, 2012 CNY | Dec. 31, 2011 CNY | Dec. 31, 2010 CNY
Schedule of Investments [Line Items] |  |  |  |
Short-term investment interest income | $ 116.60 | 726.40 | 149.35 | 37.21

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- Definition Short-term investment gains and interest income. + References No definition available. + Details
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- Details
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