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Accounts receivable, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Accounts Receivable Net [Line Items]            
Accounts receivable, gross       ¥ 224,791   ¥ 191,144
Less: allowance for doubtful receivables ¥ (58,791) ¥ (58,791) ¥ (31,214) (55,220)   (58,791)
Accounts receivable, net       ¥ 169,571 $ 24,423 ¥ 132,353
Summary of allowance for doubtful accounts            
Balance at beginning of the year (58,791) (57,342) (31,214)      
(Additions)/reversals charged to general and administrative expenses, net 3,571 (1,449) (26,246)      
Write-off during the year 118      
Balance at end of the year ¥ (55,220) ¥ (58,791) ¥ (57,342)