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Benefits and interests of directors - Summary of Detailed Information of Directors Emoluments (Detail) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information of directors emoluments [line items]      
Salaries and bonuses ¥ 21,081 ¥ 26,728 ¥ 29,192
Other benefits 16,038 29,804 34,560
Total 59,838 112,849 132,523
Director [Member]      
Disclosure of detailed information of directors emoluments [line items]      
Director's fee 2,448 2,580 3,157
Salaries and bonuses 15,003 35,237 39,105
Social security and housing fund 181 231 121
Other benefits 4,762 4,808 5,214
Total 22,394 42,856 47,597
Director [Member] | Executive Directors [member] | Cho Yong Suk [member]      
Disclosure of detailed information of directors emoluments [line items]      
Salaries and bonuses 7,750 14,070 9,750
Social security and housing fund 82 74 30
Other benefits 2,242 2,147 2,239
Total 10,074 16,291 12,019
Director [Member] | Executive Directors [member] | Gregory Dean Gibb [member]      
Disclosure of detailed information of directors emoluments [line items]      
Salaries and bonuses 4,580 8,410 8,880
Social security and housing fund 76 74 65
Other benefits 2,433 1,963 2,156
Total 7,089 10,447 11,101
Director [Member] | Executive Directors [member] | Ji Guangheng [member]      
Disclosure of detailed information of directors emoluments [line items]      
Salaries and bonuses 2,673 12,090 10,375
Social security and housing fund 23 83 26
Other benefits 87 523 297
Total 2,783 12,696 10,698
Director [Member] | Executive Directors [member] | Li Renjie [member]      
Disclosure of detailed information of directors emoluments [line items]      
Salaries and bonuses   667 10,100
Other benefits   175 522
Total   842 10,622
Director [Member] | Non-Executive Directors [member] | Zhang Xudong [member]      
Disclosure of detailed information of directors emoluments [line items]      
Director's fee 500 500 400
Total 500 500 400
Director [Member] | Non-Executive Directors [member] | Li Weidong [member]      
Disclosure of detailed information of directors emoluments [line items]      
Director's fee 500 500 400
Total 500 500 400
Director [Member] | Non-Executive Directors [member] | Kwong Che Keung Gordon [member]      
Disclosure of detailed information of directors emoluments [line items]      
Director's fee     224
Total     224
Director [Member] | Non-Executive Directors [member] | Ha Jiming [member]      
Disclosure of detailed information of directors emoluments [line items]      
Director's fee   164 1,957
Total   164 1,957
Director [Member] | Non-Executive Directors [member] | Yang Rusheng [member]      
Disclosure of detailed information of directors emoluments [line items]      
Director's fee 500 500 176
Total 500 500 ¥ 176
Director [Member] | Non-Executive Directors [member] | Tang Yunwei [member]      
Disclosure of detailed information of directors emoluments [line items]      
Director's fee 448 458  
Total 448 458  
Director [Member] | Non-Executive Directors [member] | Li Xianglin [member]      
Disclosure of detailed information of directors emoluments [line items]      
Director's fee 500 458  
Total ¥ 500 ¥ 458