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Redeemable noncontrolling interests (Details)
¥ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Sep. 30, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Apr. 30, 2018
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2016
CNY (¥)
Capital contribution from redeemable noncontrolling interests   ¥ 37,733 ¥ 30,000         ¥ 90,000
Repurchase of redeemable noncontrolling interests ¥ 10,000     ¥ 10,000 $ 1,533 ¥ 37,733 ¥ 30,000  
Noncontrolling Shareholders [Member]                
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     10.00%         30.00%
Ownership interest repurchased (as a percent)   10.00%