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Revenues by Geographic Area (Detail) In Thousands, 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
Revenues: |  |  |  |
PRC | $ 3,563,135 | 22,198,685 | 14,444,636 | 7,898,805
Non-PRC | $ 17,229 | 107,341 | 56,150 | 16,269

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