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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