Intangible Assets - Goodwill - Carrying Amount of Goodwill Allocated (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)
Yuchai
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	¥ 212,636	$ 30,012	¥ 212,636

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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Balance Type:	debit
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