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Certain risks and concentration (Narrative) (Details)
¥ in Thousands
12 Months Ended
Dec. 31, 2016
CNY (¥)
item
Dec. 31, 2015
CNY (¥)
item
Dec. 31, 2014
CNY (¥)
Certain risks and concentration [Line Items]      
Maximum foreign ownership in internet information provider or other value-added telecommunication service provider's business allowed under PRC laws and regulations 50.00%    
Number of VIEs or their shareholders entitled to terminate the contracts prior to the expiration date 0    
Number of VIEs have accumulated losses since inception 0    
Minimum [Member]      
Certain risks and concentration [Line Items]      
Term of contractual agreements 10 years    
Maximum [Member]      
Certain risks and concentration [Line Items]      
Term of contractual agreements 30 years    
Guangzhou Huaduo [Member]      
Certain risks and concentration [Line Items]      
Equity interests ownership (as a percent) 100.00%    
Guangzhou Huaduo [Member] | Guangzhou Huanju Shidai and Beijing Huanju Shidai [Member]      
Certain risks and concentration [Line Items]      
Service fees | ¥ ¥ 305,792 ¥ 274,285 ¥ 363,117
Beijing Tuda and Guangzhou Huaduo [Member] | Beijing Huanju Shidai [Member]      
Certain risks and concentration [Line Items]      
Maximum percentage of the income of VIEs which may be charged as service fees 100.00%    
Maximum percentage of the profits payable by VIEs 100.00%    
Accounts receivable [Member] | Credit concentration [Member] | Top 10 accounts receivable [Member]      
Certain risks and concentration [Line Items]      
Number of top accounts receivable | item 10 10  
Concentration percentage 75.00% 82.00%