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Intangible Assets - Goodwill - Carrying Amount of Goodwill Allocated (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Yuchai manufacturing business [member]      
Disclosure of reconciliation of changes in goodwill [line items]      
Goodwill ¥ 212,636 $ 29,641 ¥ 212,636