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Accounts receivable, net (Schedule of Accounts Receivable, Net) (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2013
CNY (¥)
Dec. 31, 2012
CNY (¥)
Accounts receivable, net [Abstract]          
Accounts receivable   ¥ 353,364 ¥ 204,541    
Less: allowance for doubtful receivables   4,870
Accounts receivable, net $ 53,798 ¥ 348,494 ¥ 204,541