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Accounts Receivable, Net - Schedule of Analysis of Allowance for Doubtful Accounts (Detail)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2013
CNY
Dec. 31, 2012
CNY
Sep. 30, 2014
USD ($)
Sep. 30, 2014
CNY
Receivables [Abstract]          
Beginning balance $ 192 1,161 371 $ 200 1,243
Additions charged to bad debt expense 41 251 790    
Write off (26) (159)       
Ending balance $ 207 1,253 1,161 $ 200 1,243