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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, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2020 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 | ¥ 140,000 | ¥ 50,000 | $ 21,634
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 | ¥ 90,000 | ¥ 50,000 | $ 13,900
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 | 0.23% | 1.78% |
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% | 3.99% |
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 | 2.25% | 3.65% |
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% | 4.13% |

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