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Goodwill - Carrying Amount of Goodwill Allocated to Cash-generating Unit (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)		Jan. 01, 2017 CNY (¥)	[1]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	$ 31,784	¥ 212,636	$ 31,784	¥ 212,636	[1]	¥ 212,636
Guangxi Yuchai Machinery Company Lmited [member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	$ 31,784	¥ 212,636		¥ 212,636
[1] Restated

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- 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.

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- Definition

The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

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