v2.4.0.6

Benefit of Tax Holiday Per Basic and Diluted Earnings Per Share (Detail) | 12 Months Ended
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Dec. 31, 2011 Earning Per Share, Basic USD ($) | Dec. 31, 2011 Earning Per Share, Basic CNY | Dec. 31, 2010 Earning Per Share, Basic CNY | Dec. 31, 2009 Earning Per Share, Basic CNY | Dec. 31, 2011 Earning Per Share, Diluted USD ($) | Dec. 31, 2011 Earning Per Share, Diluted CNY | Dec. 31, 2010 Earning Per Share, Diluted CNY | Dec. 31, 2009 Earning Per Share, Diluted CNY
Income Tax Holiday [Line Items] |  |  |  |  |  |  |  |
Basic | $ 0.01 | 0.05 | 0.46 | 0.32 | $ 0.01 | 0.05 | 0.45 | 0.30

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- Definition The per share effect of the aggregate dollar amount of the income tax benefit resulting from the income tax holidays granted to the entity by taxing jurisdictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 11 -Section C Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 11.C) -URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330215-122817 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration