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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, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2019
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 ¥ 50,000 ¥ 70,000 $ 7,057
Long term deposits less than maturity 12 months    
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 ¥ 50,000 ¥ 70,000 $ 7,100
Long term deposits maturity 2 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 1.78% 1.40%  
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 3.99% 2.94%  
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 3.65% 3.90%  
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 4.13% 3.15%