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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, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2022
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 ¥ 20,000 ¥ 110,000 $ 2,877
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  
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 0.80% 0.30%  
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 4.36% 1.65%