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Depreciation, amortization, shipping and handling expenses - Summary of Sales Related Shipping and Handling Expenses Not Separately Billed to Customers (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)
Selling general and administrative expenses [member]
Disclosure of income statement [line items]
Selling, general and administrative expenses	¥ 224,292	$ 35,477	¥ 237,683	¥ 221,255

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- Definition

Disclosure of income statement [line items]

+ References

No definition available.

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- Definition

Shipping and handling costs.

+ References

No definition available.

+ Details

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

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- Details

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