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Investment in Associates - Details of Associates (Detail)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Sinjori Sdn Bhd [member]    
Disclosure of associates [line items]    
Principal activities Property investment and development  
Place of incorporation Malaysia  
Place of business Malaysia  
Group's effective equity interest 14.00% 14.00%
Guangxi Yuchai Quan Xing Machinery Company Ltd [member]    
Disclosure of associates [line items]    
Principal activities Manufacture spare part and sales of auto spare part, diesel engine & spare part, metallic materials, generator & spare part, chemical products (exclude dangerous goods), lubricating oil  
Place of incorporation People's Republic of China  
Place of business People's Republic of China  
Group's effective equity interest 15.30% 15.30%