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Financial Risk Management Objectives and Policies - Additional Information (Detail) ¥ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 CNY (¥) Customer | Dec. 31, 2024 USD ($) Customer | Dec. 31, 2023 CNY (¥) Customer | Dec. 31, 2024 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Basis points | 50.00% |  | 50.00% | 50.00%
Increase decrease in profit before tax on basis of higher lower basis points | ¥ 12.5 | $ 1.7 | ¥ 12.7 |
People's Republic of China [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Number of top customers | 5 | 5 | 5 |
People's Republic of China [member] | Top 5 Customers [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Amount owed | ¥ 242.4 |  | ¥ 597.7 | $ 33.8
Percentage of trade receivables excluding bills receivables | 13.30% | 13.30% | 38.60% |

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