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Deposits for Non-Current Assets - Additional Information (Detail) In Thousands, unless otherwise specified	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY	Dec. 31, 2013 CNY	Dec. 31, 2014 Property, Plant and Equipment [Member] CNY	Dec. 31, 2013 Property, Plant and Equipment [Member] CNY	Dec. 31, 2012 Property, Plant and Equipment [Member] CNY
Valuation and Qualifying Accounts Disclosure [Line Items]
Reserve for unrecoverable deposits	$ 4,279ccm_ReserveForUnrecoverableDepositsNoncurrent	26,552ccm_ReserveForUnrecoverableDepositsNoncurrent	26,552ccm_ReserveForUnrecoverableDepositsNoncurrent			3,360ccm_ReserveForUnrecoverableDepositsNoncurrent / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_PropertyPlantAndEquipmentMember

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- Definition

Land Use Rights Amortization Expense Next Twelve Months

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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