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Other Current Assets - Summary of Other Current Assets (Parenthetical) (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)
Other Current Assets [line items]
Proceeds from disposal of equity securities	¥ 6,500	$ 1,026	¥ 1,354	¥ 16,429
Gain on disposal on equity investments	¥ 5,400	$ 900	¥ 900

X

- Definition

Gains on disposals of investment.

+ References

No definition available.

+ Details

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Namespace Prefix:	cyd_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Other current assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	cyd_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The cash inflow from sales or maturity of financial instruments, classified as investing activities. [Refer: Financial instruments, class [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2021-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_16&doctype=Standard
-URIDate 2021-03-24

+ Details

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