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Investment in Joint Ventures - Share of Results of Joint Ventures and Carrying Amount of Investment to Joint Ventures (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |
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Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2024 USD ($)
Disclosure of joint ventures [line items] |  |  |  |  |
Share of results of joint ventures, net of tax | ¥ 101,553 | $ 14,156 | ¥ 62,083 | ¥ (27,546) |
Carrying amount of investments | 338,579 |  | 237,229 | 154,703 | $ 47,197
Y & C Engine Co., Ltd. [member] |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Share of results of joint ventures, net of tax | 15,680 | 2,186 | (4,019) | (54,116) |
Carrying amount of investments | 34,872 |  | 12,977 |  | 4,861
MTU Yuchai Power Co., Ltd [member] |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Share of results of joint ventures, net of tax | 86,504 | 12,058 | 74,727 | 40,279 |
Carrying amount of investments | 286,841 |  | 203,156 |  | 39,985
Guangxi Purem Yuchai Automotive Technology Co., Ltd [member] |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Share of results of joint ventures, net of tax | 987 | 138 | (4,508) | (11,278) |
Carrying amount of investments | 16,856 |  | 15,869 |  | 2,350
Other Joint Ventures [member] |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Share of results of joint ventures, net of tax | (1,618) | $ (226) | (4,117) | ¥ (2,431) |
Carrying amount of investments | ¥ 10 |  | ¥ 5,227 |  | $ 1

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- Definition The amount of investments in joint ventures in an entity's separate financial statements. [Refer: Total for all joint ventures [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2024-01-01 -Paragraph 10 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_10&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The entity's share of the profit (loss) of joint ventures accounted for using the equity method. [Refer: Investments accounted for using equity method; Total for all joint ventures [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_85&doctype=Standard -URIDate 2024-03-27 + Details
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