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Income Tax Expense - Summary of Deferred Tax (Parenthetical) (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Disclosure of deferred tax assets and liabilities [Line Items]
Beginning balance		¥ 198,922
Ending balance	$ 33,554	224,479	¥ 198,922
PRC withholding tax on dividend income [Member]
Disclosure of deferred tax assets and liabilities [Line Items]
Beginning balance	(15,033)	(100,572)	(103,347)
Provision made to consolidated statement of profit or loss	(4,460)	(29,842)	(29,031)
Utilization	3,511	23,492	31,806
Ending balance	$ (15,982)	¥ (106,922)	¥ (100,572)

X

- Definition

Deferred tax liability (asset) utilization.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Disclosure of deferred tax assets and liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	cyd_
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Balance Type:	na
Period Type:	duration

X

- Definition

The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2018-01-01
-Paragraph 81
-Subparagraph g
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_ii&doctype=Standard
-URIDate 2018-03-16

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X

- Definition

The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2018-01-01
-Paragraph 81
-Subparagraph g
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_i&doctype=Standard
-URIDate 2018-03-16

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X

- Details

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Namespace Prefix:
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