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Restricted net assets (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Percentage of after-tax income required to be transferred to statutory general reserve fund 10.00%  
Reserve level threshold for mandatory appropriation requirement (as a percent) 50.00%  
Restricted net assets ¥ 5,057,086 ¥ 3,559,861