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ACCOUNTS RECEIVABLE (Tables)
 12 Months Ended
Dec. 31, 2015
ACCOUNTS RECEIVABLE [Abstract]  
Schedule of Accounts Receivable
As at December 31,
2014 2015      2015  
RMB RMB      US$  

Accounts receivable

      267,291       220,035       33,968  

Allowance for doubtful accounts 

      (2,281 )     (1,781 )     (275 )

Accounts receivable, net

   265,010       218,254       33,693  

 

For the Years Ended December 31,
2013 2014      2015      2015  
RMB RMB      RMB      US$  

The movement in the allowance for doubtful accounts were as follows: 

            

Balance at the beginning of the year

      3,091       3,091       2,281       352  

 Acquisition of CHS

     —       —       167       26  

Provisions for the year

      —       700       2,925       452  

Reversal of provisions from prior periods due to subsequent cash collection during the year

      —
    (1,510 )      (749 )     (116 )

Amounts written off during the year

     —       —       (2,843 )      (439 ) 

Balance at the end of the year

   3,091        2,281       1,781       275