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Business combination (Narrative) (Details)
¥ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Feb. 03, 2015
CNY (¥)
Dec. 23, 2014
CNY (¥)
Dec. 02, 2014
CNY (¥)
Feb. 28, 2015
Dec. 31, 2015
USD ($)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2013
CNY (¥)
Business combination [Line Items]                
Goodwill         $ 23,409 ¥ 300,382 ¥ 151,638 ¥ 1,577
Brand Name [Member]                
Business combination [Line Items]                
Estimated useful lives         10 years 11 years    
Software [Member]                
Business combination [Line Items]                
Estimated useful lives         5 years 4 years    
100 Online and DuBooker [Member]                
Business combination [Line Items]                
Percentage of equity interests acquired     100.00%          
Cash consideration     ¥ 60,000          
Base contingent payment to be made when achieves specific percentage of performance metrics     100.00%          
Maximum undiscounted amounts the Company could have paid under the contingent consideration provisions of the agreement     ¥ 240,000          
Contingent consideration     183,000          
Goodwill     ¥ 195,893          
100 Online and DuBooker [Member] | Cooperation Agreements [Member]                
Business combination [Line Items]                
Estimated useful lives     3 years          
100 Online and DuBooker [Member] | Non-compete Agreements [Member]                
Business combination [Line Items]                
Estimated useful lives     5 years          
100 Online and DuBooker [Member] | Copyrights of teaching material [Member]                
Business combination [Line Items]                
Estimated useful lives     5 years          
100 Online and DuBooker [Member] | Brand Name [Member]                
Business combination [Line Items]                
Estimated useful lives     9 years          
Xingxue and Chuangzhi [Member]                
Business combination [Line Items]                
Percentage of equity interests acquired   100.00%       100.00%    
Cash consideration   ¥ 128,000            
Goodwill   ¥ 100,382            
Xingxue and Chuangzhi [Member] | Brand Name [Member]                
Business combination [Line Items]                
Estimated useful lives   15 years            
Xingxue and Chuangzhi [Member] | Software [Member]                
Business combination [Line Items]                
Estimated useful lives   5 years            
Beifu [Member]                
Business combination [Line Items]                
Percentage of equity interests acquired 70.00%     70.00%        
Cash consideration ¥ 39,200              
Base contingent payment to be made when achieves specific percentage of performance metrics 100.00%              
Maximum undiscounted amounts the Company could have paid under the contingent consideration provisions of the agreement ¥ 219,000              
Contingent consideration 107,000              
Goodwill ¥ 147,388              
Beifu [Member] | Non-compete Agreements [Member]                
Business combination [Line Items]                
Estimated useful lives       7 years        
Beifu [Member] | Online game hosts [Member]                
Business combination [Line Items]                
Estimated useful lives       3 years