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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%