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Significant Accounting Judgments, Estimates and Assumptions - Additional Information (Detail) ¥ in Thousands, $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2017	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 CNY (¥)
Disclosure of changes in accounting estimates [Line Items]
Carrying amounts of deferred tax assets		¥ 315,390		¥ 308,207	$ 49,829
Increase in profit if all unrecognized deferred tax asset were recognized		182,726	$ 28,869	189,589
Carrying amounts of allowance for doubtful accounts		43,775		54,634	6,916	$ 8,632	¥ 51,288
Carrying amounts of inventory provision		106,895		126,796	16,889
Provision of product warranty		¥ 290,306		238,850	45,866
Percentage of withholding tax		10.00%	10.00%
Provision for withholding tax payable		¥ 100,572		¥ 103,347	$ 15,890
Yuchai [Member] | Jining Yuchai Engine Company Limited [Member]
Disclosure of changes in accounting estimates [Line Items]
Acquisition of equity interest	100.00%	100.00%	100.00%
Bottom of range [Member]
Disclosure of changes in accounting estimates [Line Items]
Cash flows derived from forecasts period		8 years	8 years
Top of range [Member]
Disclosure of changes in accounting estimates [Line Items]
Cash flows derived from forecasts period		15 years	15 years

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- Definition

Acquisition of equity interest.

+ References

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- Definition

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Inventory provision.

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- Definition

Provision for withholding tax payable.

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- Definition

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IFRS
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-IssueDate 2016-01-13
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The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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The explanation of the period over which management has projected cash flows based on financial budgets/forecasts approved by management including, when a period greater than five years is used for a cash-generating unit (group of units), an explanation of why that longer period is justified. [Refer: Cash-generating units [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of current provision for warranties. [Refer: Warranty provision]

+ References

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