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Intangible Assets - Additional Information (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2021
USD ($)
Disclosure of detailed information about intangible assets [line items]          
Intangible asset, carrying amount ¥ 1,758,582   ¥ 1,483,968   $ 278,160
Pre-tax discount rate 12.54% 12.54% 12.37%    
Estimated revenue growth rate 0.00% 0.00% 0.00%    
Pre-tax discount rate that would result in an impairment 14.03%   13.58%   14.03%
Estimation of future business projection In 2020 and 2021, the Group performs an impairment test on the development costs that are not available for use. No impairment has been identified. The recoverable amount was determined based on its value in use using the discounted cash flow approach. Cash flows were projected based on historical growth, past experience and management best estimation of future business outlook. Both the 2020 and 2021, the Group used 8 years forecast and were based on the updated financial budgets approved by the senior management with no terminal value. In 2020 and 2021, the Group performs an impairment test on the development costs that are not available for use. No impairment has been identified. The recoverable amount was determined based on its value in use using the discounted cash flow approach. Cash flows were projected based on historical growth, past experience and management best estimation of future business outlook. Both the 2020 and 2021, the Group used 8 years forecast and were based on the updated financial budgets approved by the senior management with no terminal value.      
Pre-tax discount rate that would results in an impairment 15.69%   20.05%   15.69%
Long term rates used to extrapolate the budget 5.00%   6.00%   5.00%
Reduction in long term growth rate that would result in an impairment 1.53%   3.60%   1.53%
Payment for trademark license fee       ¥ 169,800  
Capitalized developemnt costs gross ¥ 1,758,582   ¥ 1,483,968   $ 278,160
Bottom of range [member]          
Disclosure of detailed information about intangible assets [line items]          
Estimated revenue growth rate 5.00% 5.00% 5.00%    
Percentage decrease in demand that would result in an impairment 13.86%   13.99%   13.86%
Top of range [member]          
Disclosure of detailed information about intangible assets [line items]          
Estimated revenue growth rate 12.00% 12.00% 10.00%    
Percentage decrease in demand that would result in an impairment 15.21%   25.94%   15.21%
Guangxi Yuchai Machinery Company Limited [member]          
Disclosure of detailed information about intangible assets [line items]          
Pre-tax discount rate applied to cash flow projection 12.54%   12.37%   12.54%
Impairment on goodwill ¥ 0        
Technology development cost [member]          
Disclosure of detailed information about intangible assets [line items]          
Intangible asset, carrying amount 313,600   ¥ 530,800   $ 49,600
Capitalized developemnt costs gross 992,300       $ 157,000
Technology Know How [Member]          
Disclosure of detailed information about intangible assets [line items]          
Intangible asset, carrying amount     8,100    
Transfers from development costs to Technology Know-how ¥ 414,700 $ 65,600      
Technology Know How [Member] | Accumulated impairment [member]          
Disclosure of detailed information about intangible assets [line items]          
Intangible asset, carrying amount     ¥ (126,700)