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Investments in Subsidiaries - Additional Information (Detail) ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 CNY (¥) | Jun. 30, 2024 USD ($) | Feb. 28, 2023 CNY (¥) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2024 USD ($)
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Cash and cash equivalents subject to local exchange control regulations |  |  |  | ¥ 5,500,000 |  |  | ¥ 4,900,000 | $ 763,400
Contribution by non-controlling interests |  |  |  | 83,097 | $ 11,583 | ¥ 20,000 | ¥ 53,500 |
Suzhou reman [member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Net cash inflows from disposal of subsidiary |  |  |  | 230,900 | 32,200 |  |  |
Restricted cash in proceeds from disposal of subsidiary |  |  |  | 13,400 | $ 1,900 |  |  |
Proceed received from disposal of subsidiary |  |  |  | 235,900 |  |  |  | 32,900
Restricted cash received in proceeds from disposal of subsidiary |  |  |  | ¥ 18,400 |  |  |  | $ 2,600
Yuchai Simlan [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Cash consideration |  |  | ¥ 20,000 |  |  |  |  |
Percent of shareholding in subsidiary |  |  | 67.00% |  |  |  | 69.50% |
Guangxi Yuchai Marine and Genset Power Co., Ltd [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Percent of shareholding in subsidiary | 71.40% | 71.40% |  | 71.40% | 71.40% | 76.40% |  |
Contribution by non-controlling interests | ¥ 82,900 | $ 11,600 |  |  |  |  |  |

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