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Movement in Allowance for Doubtful Accounts (Detail) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 USD ($) | Dec. 31, 2011 CNY | Dec. 31, 2010 CNY | Dec. 31, 2009 CNY
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Balance at the beginning of the year | $ 353 | 2,223 | 9,015 | 8,561
Amounts charged to (credited against) costs and expenses | 569 | 3,583 | (6,792) | 454
Balance at the end of the year | $ 922 | 5,806 | 2,223 | 9,015

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