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Share capital and additional paidin capital (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement [Line Items]      
Beginning balance, amount ¥ 383,500 ¥ 383,500 ¥ 383,499
Shares issued during the year, Amount   0 1
Ending balance, amount 383,500 383,500 383,500
Non-controlling interests [Member]      
Statement [Line Items]      
Beginning balance, amount 95,875 95,875 95,875
Shares issued during the year, Amount   0 0
Ending balance, amount ¥ 95,875 ¥ 95,875 ¥ 95,875
Number of shares [Member]      
Statement [Line Items]      
Shares issued during the year, Shares 1,070 269 862
Beginning balance, shares 1,001,131 1,000,862 1,000,000
Ending balance, shares 1,002,201 1,001,131 1,000,862
Total Equity [member]      
Statement [Line Items]      
Beginning balance, amount ¥ 479,375 ¥ 479,375 ¥ 479,374
Shares issued during the year, Amount     1
Ending balance, amount 479,375 479,375 479,375
Ordinary Shares [Member]      
Statement [Line Items]      
Beginning balance, amount 326 326 325
Shares issued during the year, Amount     1
Ending balance, amount 326 326 326
Additional paid-in capital      
Statement [Line Items]      
Beginning balance, amount 383,174 383,174 383,174
Shares issued during the year, Amount   0 0
Ending balance, amount ¥ 383,174 ¥ 383,174 ¥ 383,174