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Investment in Joint Ventures - Share of Results of Joint Ventures and Carrying Amount of Investment to Joint Ventures (Parenthetical) (Detail) ¥ in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019 CNY (¥)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2017 CNY (¥)
Disclosure of joint ventures [line items]
Additional investment in associates			¥ 41,160	$ 5,809	¥ 75,000
Eberspaecher Yuchai [member]
Disclosure of joint ventures [line items]
Additional investment in associates	¥ 17,600	$ 2,500	¥ 23,500	$ 3,300

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- Definition

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

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No definition available.

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- Definition

The cash outflow for the purchase of interests in investments accounted for using the equity method. [Refer: Investments accounted for using equity method]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2019-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_16&doctype=Standard
-URIDate 2019-03-27

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