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Prepaid Operating Leases - Additional Information (Detail) - CNY (¥) ¥ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about arrangements involving legal form of lease [line items]
Prepaid operating leases pledged to secure bank facilities	¥ 0	¥ 0
Bottom of range [member]
Disclosure of detailed information about arrangements involving legal form of lease [line items]
Land use rights terms	15 years
Top of range [member]
Disclosure of detailed information about arrangements involving legal form of lease [line items]
Land use rights terms	50 years

X

- Definition

Land use rights operating lease terms.

+ References

No definition available.

+ Details

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X

- Definition

Prepaid operating leases pledged as security

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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