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Issued capital - Summary of Issued Capital (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2023
CNY (¥)
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
CNY (¥)
shares
Ordinary shares issued and fully paid      
Ending balance     40,858,290
Equity      
Ending balance ¥ 2,081,138 $ 292,969 ¥ 2,081,138
One special share issued and fully paid at US$0.10 per share Less than RMB 1 (US$ 1) Less than RMB 1 (US$ 1) Less than RMB 1 (US$ 1)
Ordinary shares [member]      
Disclosure of classes of share capital [line items]      
Ordinary share of par value US$0.10 each 100,000,000 100,000,000 100,000,000