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Commitments and Contingencies - 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
Commitments and Contingencies Disclosure [Abstract]              
Operating leases, rental expenses $ 3,387 20,790 12,780 $ 2,957 17,898 12,038 8,035
Recognized liabilities related to unrecognized tax benefits $ 4,731 29,041   $ 4,797 29,041 16,568