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Property and Equipment, Net - Additional Information (Detail)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
USD ($)
Sep. 30, 2014
CNY
Sep. 30, 2013
CNY
Dec. 31, 2013
USD ($)
Dec. 31, 2013
CNY
Dec. 31, 2012
CNY
Dec. 31, 2011
CNY
Property, Plant and Equipment [Abstract]              
Depreciation expense $ 4,130 25,350 17,647 $ 4,220 25,548 14,301 6,347