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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
	Dec. 31, 2023 CNY (¥)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 CNY (¥)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2023 USD ($)
Disclosure of joint ventures [line items]
Share of results of joint ventures, net of tax:	¥ 62,083	$ 8,740	¥ (27,546)	¥ (95,985)
Carrying amount of investments	237,229		154,703	151,095	$ 33,396
Y & C Engine Co., Ltd. [member]
Disclosure of joint ventures [line items]
Share of results of joint ventures, net of tax:	(4,019)	(566)	(54,116)	(125,853)
Carrying amount of investments	12,977		488		1,827
MTU Yuchai Power Co., Ltd [member]
Disclosure of joint ventures [line items]
Share of results of joint ventures, net of tax:	74,727	10,520	40,279	28,037
Carrying amount of investments	203,156		128,140		28,599
Guangxi Purem Yuchai Automotive Technology Co., Ltd [member]
Disclosure of joint ventures [line items]
Share of results of joint ventures, net of tax:	(4,508)	(635)	(11,278)	1,377
Carrying amount of investments	15,869		20,377		2,234
Other Joint Ventures [member]
Disclosure of joint ventures [line items]
Share of results of joint ventures, net of tax:	(4,117)	$ (579)	(2,431)	¥ 454
Carrying amount of investments	¥ 5,227		¥ 5,698		$ 736

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The amount of investments in joint ventures in an entity's separate financial statements. [Refer: Joint ventures [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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)]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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