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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

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