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