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Earnings per share - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings per share [Abstract]
Number of employees share option plan, anti-dilutive	470,000	530,000	570,000

X

- Definition

Anti-dilutive effect of share options on number of ordinary shares.

+ References

No definition available.

+ Details

Name:	cyd_AntiDilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares
Namespace Prefix:	cyd_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	ifrs-full_EarningsPerShareAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration