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Shareholders' Equity (Detail) In Thousands, unless otherwise specified | Dec. 31, 2012 USD ($) | Dec. 31, 2012 CNY | Dec. 31, 2011 CNY
--- | --- | --- | ---
Retained Earnings Adjustments [Line Items] |  |  |
PRC statutory reserve funds | $ 44,592 | 277,812 | 249,880
Unreserved retained earnings | 3,813,808 | 23,760,407 | 13,354,454
Total retained earnings | $ 3,858,400 | 24,038,219 | 13,604,334

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