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Cash and Cash Equivalents - Summary of Cash and Bank Balances (Parenthetical) (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2021 USD ($)
Disclosure of detailed cash and cash equivalents short term bank deposits current restricted cash and long term bank deposits [line items] |  |  |
Long-term bank deposits | ¥ 110,000 | ¥ 140,000 | $ 17,399
Guangxi Yuchai Machinery Monopoly Development Company Limited [member] |  |  |
Disclosure of detailed cash and cash equivalents short term bank deposits current restricted cash and long term bank deposits [line items] |  |  |
Long-term bank deposits | ¥ 20,000 | ¥ 90,000 | $ 3,200
Interest rate long term bank deposit | 3.85% |  |
Long term deposits maturity | 3 years |  |
Bottom of range [member] |  |  |
Disclosure of detailed cash and cash equivalents short term bank deposits current restricted cash and long term bank deposits [line items] |  |  |
Interest rate short term bank deposit | 0.30% | 0.23% |
Bottom of range [member] | Guangxi Yuchai Machinery Monopoly Development Company Limited [member] |  |  |
Disclosure of detailed cash and cash equivalents short term bank deposits current restricted cash and long term bank deposits [line items] |  |  |
Interest rate long term bank deposit |  | 3.85% |
Top of range [member] |  |  |
Disclosure of detailed cash and cash equivalents short term bank deposits current restricted cash and long term bank deposits [line items] |  |  |
Interest rate short term bank deposit | 1.65% | 2.25% |
Top of range [member] | Guangxi Yuchai Machinery Monopoly Development Company Limited [member] |  |  |
Disclosure of detailed cash and cash equivalents short term bank deposits current restricted cash and long term bank deposits [line items] |  |  |
Interest rate long term bank deposit |  | 3.99% |

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