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Investment in equity investees (Details 2) - CNY (¥)
¥ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Cost-method Investments [Line Items]    
Carrying value of cost method investments ¥ 3,308,127 ¥ 586,959
Cost method investments 2,856,500  
Top investee one    
Schedule of Cost-method Investments [Line Items]    
Cost method investments 648,829  
Top investee two    
Schedule of Cost-method Investments [Line Items]    
Cost method investments ¥ 551,957