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Intangible Assets - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2017
CNY (¥)
Disclosure of detailed information about intangible assets [line items]          
Intangible asset, carrying amount ¥ 954,144,000   ¥ 418,637,000 $ 134,669  
Pre-tax discount rate 13.32% 13.32% 13.96%    
Estimated revenue growth rate 0.00% 0.00% 5.00%    
Pre-tax discount rate that would result in an impairment 14.79%   14.28% 14.79%  
Increase decrease in impairment charge 4.53% 4.53% 3.30%    
Estimation of future business projection In 2018, the Group used a 11 years forecast which is based on the financial budgets approved by the senior management covering 8 years’ period from 2019 to 2026, and a further 3 years of forecast with no terminal value. In 2019, the Group used 10 years forecast which is based on the financial budgets approved by the senior management covering 6 years’ period from 2020 to 2025, and a further 4 years of forecast with no terminal value. In 2018, the Group used a 11 years forecast which is based on the financial budgets approved by the senior management covering 8 years’ period from 2019 to 2026, and a further 3 years of forecast with no terminal value. In 2019, the Group used 10 years forecast which is based on the financial budgets approved by the senior management covering 6 years’ period from 2020 to 2025, and a further 4 years of forecast with no terminal value.      
Pre-tax discount rate applied to cash flow projection 14.13%   26.30% 14.13%  
Long term rates used to extrapolate the budget 5.70%   6.30% 5.70%  
Percentage decrease in demand that would result in an impairment 17.57%   1.00% 17.57%  
Long term growth rate that would result in an impairment 2.40%   5.77% 2.40%  
Payment for trademark license fee ¥ 169,800,000 $ 24,000      
Capitalized developemnt costs gross ¥ 954,144,000   ¥ 418,637,000 $ 134,669  
Bottom of range [member]          
Disclosure of detailed information about intangible assets [line items]          
Estimated revenue growth rate 10.00% 10.00%      
Top of range [member]          
Disclosure of detailed information about intangible assets [line items]          
Estimated revenue growth rate 15.00% 15.00%      
Guangxi Yuchai Machinery Company Limited [member]          
Disclosure of detailed information about intangible assets [line items]          
Pre-tax discount rate applied to cash flow projection 13.32%   13.96% 13.32%  
Impairment on goodwill ¥ 0        
Technology development cost [member]          
Disclosure of detailed information about intangible assets [line items]          
Intangible asset, carrying amount 366,700,000   ¥ 195,900,000 $ 51,800 ¥ 10,100,000
Capitalized developemnt costs gross ¥ 562,600,000     $ 79,400  
Jining Yuchai Engine Company Limited [member]          
Disclosure of detailed information about intangible assets [line items]          
Intangible asset, carrying amount         ¥ 10,100,000