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Property and Equipment, Net - Additional Information (Detail) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2014 CNY | Dec. 31, 2013 CNY | Dec. 31, 2012 CNY
Property, Plant and Equipment [Abstract] |  |  |  |
Depreciation expense | $ 5,655 us-gaap_CostOfGoodsAndServicesSoldDepreciation | 35,084 us-gaap_CostOfGoodsAndServicesSoldDepreciation | 25,548 us-gaap_CostOfGoodsAndServicesSoldDepreciation | 14,301 us-gaap_CostOfGoodsAndServicesSoldDepreciation

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- Definition Depreciation of property, plant and equipment directly related to goods produced and sold and services rendered by an entity during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
Name: | us-gaap_CostOfGoodsAndServicesSoldDepreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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