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Taxation - Income Tax Expense (Benefit) (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
Income Tax Disclosure [Abstract]              
Current       $ 22,474 136,047 84,851 34,615
Deferred       (3,924) (23,753) 6,137 3,733
Income tax expense $ 21,041 129,150 82,940 $ 18,550 112,294 90,988 38,348