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Investment in equity investees (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Cost method investments    
Carrying values of cost method investments ¥ 9,750,726 ¥ 5,138,973
Cost method investments 6,217,682 ¥ 2,210,552
Top investee one    
Cost method investments    
Cost method investments 2,688,954  
Top investee two    
Cost method investments    
Cost method investments ¥ 1,029,608