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Subsequent Event - Additional Information (Detail) - Mar. 15, 2022 - Events After Reporting Period [Member] - Beijing Yuchai Xingshunda New Energy Technology Co Ltd [Member] ¥ in Millions, $ in Millions | CNY (¥) | USD ($)
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Disclosure of non-adjusting events after reporting period [line items] |  |
Proportion of ownership interest in joint venture | 65.00% |
Registered share capital | ¥ 10.0 | $ 1.6
Beijing Xing Shun Da Bus Co Ltd [Member] |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Proportion of ownership interest in joint venture | 35.00% |

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