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Accounts Receivable, Net - Schedule of Accounts Receivable and Allowance for Doubtful Accounts (Detail)
In Thousands, unless otherwise specified
Sep. 30, 2014
USD ($)
Sep. 30, 2014
CNY
Dec. 31, 2013
USD ($)
Dec. 31, 2013
CNY
Dec. 31, 2012
USD ($)
Dec. 31, 2012
CNY
Dec. 31, 2011
CNY
Receivables [Abstract]              
Accounts receivable     $ 77,137 466,965   327,232  
Allowance for doubtful accounts (200) (1,243) (207) (1,253) (192) (1,161) (371)
Total $ 99,469 610,542 $ 76,930 465,712   326,071