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Concentration and risks (Details) - CNY (¥)
¥ in Thousands
12 Months Ended 36 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2008
Concentration and risks      
Foreign currency exchange appreciation (depreciation) rate (7.20%) (4.40%)  
Minimum      
Concentration and risks      
Foreign currency exchange appreciation (depreciation) rate     20.00%
Currency convertibility risk      
Concentration and risks      
Cash and cash equivalents, restricted cash and short-term investments ¥ 16,827,371 ¥ 12,630,577