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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, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2021 USD ($)
Disclosure of joint ventures [line items] |  |  |  |  |
Share of (loss)/profit of joint ventures, net of tax | ¥ (95,985) | $ (15,182) | ¥ (59,422) | ¥ 19,215 |
Carrying amount of the investment | 151,095 |  | 227,120 | 273,991 | $ 23,899
Y & C Engine Co., Ltd. [member] |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Share of (loss)/profit of joint ventures, net of tax | (125,853) | (19,907) | (44,016) | 28,484 |
Carrying amount of the investment | 22,821 |  | 145,599 |  | 3,610
MTU Yuchai Power Co., Ltd [member] |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Share of (loss)/profit of joint ventures, net of tax | 28,037 | 4,435 | 3,238 | 594 |
Carrying amount of the investment | 89,481 |  | 62,217 |  | 14,153
Eberspaecher Yuchai Exhaust Technology Co., Ltd [member] |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Share of (loss)/profit of joint ventures, net of tax | 1,377 | 218 | (19,157) | (9,366) |
Carrying amount of the investment | 31,655 |  | 12,638 |  | 5,007
Other Joint Ventures [member] |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Share of (loss)/profit of joint ventures, net of tax | 454 | $ 72 | 513 | ¥ (497) |
Carrying amount of the investment | ¥ 7,138 |  | ¥ 6,666 |  | $ 1,129

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- Definition The amount of investments in joint ventures in an entity's separate financial statements. [Refer: Joint ventures [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2021-01-01 -Paragraph 10 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2021-en-r&anchor=para_10&doctype=Standard -URIDate 2021-03-24 + 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; Joint ventures [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_85&doctype=Standard -URIDate 2021-03-24 + Details
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