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Investment in Associates - Details of Associates (Parenthetical) (Detail) - 12 months ended Dec. 31, 2017 ¥ in Thousands, $ in Thousands	CNY (¥)	USD ($)
Disclosure of associates [Line Items]
Consideration for disposal of interest in associates	¥ 1,832	$ 289
Gain loss on disposal of associates	199	31
Associates [Member] | State Holding Company Limited [Member]
Disclosure of associates [Line Items]
Consideration for disposal of interest in associates	1,832	289
Gain loss on disposal of associates	¥ 199	$ 31

X

- Definition

Gains (losses) on disposals of associate.

+ References

No definition available.

+ Details

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X

- Definition

Proceeds from disposal of associate, classified as investing activities.

+ References

No definition available.

+ Details

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Namespace Prefix:	cyd_
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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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