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Other Income and Expenses Recognized in Statement of Profit and Loss - Summary of Sales Related Shipping and Handling Expenses Not Separately Billed to Customers (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Selling general and administrative expenses [member]
Disclosure of income statement [line items]
Selling, general and administrative expenses	$ 31,684	¥ 211,971	¥ 208,197	¥ 159,023

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- Definition

Disclosure of income statement [line items]

+ References

No definition available.

+ Details

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- Definition

Shipping and handling costs.

+ References

No definition available.

+ Details

Name:	cyd_ShippingAndHandlingCosts
Namespace Prefix:	cyd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

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Namespace Prefix:
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Period Type: