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Accounts receivable, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2013
CNY (¥)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Accounts receivable, net [Abstract]            
Accounts receivable, gross         ¥ 191,144 ¥ 314,778
Less: allowance for doubtful receivables ¥ (57,342) ¥ (57,342) ¥ (31,214)   (58,791) (57,342)
Accounts receivable, net       $ 20,432 ¥ 132,353 ¥ 257,436
Summary of allowance for doubtful accounts            
Balance at beginning of the year (57,342) (31,214) (5,716)      
Additions charged to general and administrative expenses ¥ (1,449) (26,246) (31,987)      
Write-off during the year 118 6,489      
Balance at end of the year ¥ (58,791) ¥ (57,342) ¥ (31,214)