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Earnings Per Share - Additional Information (Detail) - shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Earnings per share [abstract] |  |  |
Number of employee share option, anti-dilutive | 470,000 | 470,000 | 470,000

X
- Definition Number of employee share option with anti-dilutive effect. + References No definition available. + Details
Name: | cyd_AntiDilutiveEffectOfEmployeeShareOptions
Namespace Prefix: | cyd_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | ifrs-full_EarningsPerShareAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration