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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%