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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, 2012 USD ($) | Dec. 31, 2012 CNY | Dec. 31, 2011 CNY | Dec. 31, 2010 CNY
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Balance as of January 1 | $ 932 | 5,806 | 2,223 | 9,015
Amounts (credited against) charged to costs and expenses | (6) | (38) | 3,583 | (6,792)
Balance as of December 31 | $ 926 | 5,768 | 5,806 | 2,223

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