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Share based compensation (Share based awards granted to an employee of a subsidiary and Other share based compensation - Narrative) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
item
Dec. 31, 2013
CNY (¥)
Dec. 23, 2014
Share-based compensation [Line Items]          
Upfront charge to the profit and loss accounts $ 28,617 ¥ 185,372 ¥ 134,632 ¥ 117,096  
Restricted shares [Member]          
Share-based compensation [Line Items]          
Share based compensation   ¥ 3,771 ¥ 7,300  
Xingxue and Chuangzhi [Member]          
Share-based compensation [Line Items]          
Percentage of equity interests acquired     100.00%   100.00%
Number of vocational training companies acquired | item     2    
Beijing Huanqiu Xingxue Technology Development Co., Ltd [Member]          
Share-based compensation [Line Items]          
Initial percentage of equity interests of acquiree, which employees will be entitled 20.00% 20.00%      
Share based compensation   ¥ 574 ¥ 143  
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost   ¥ 32,593