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Intangible Assets - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Jan. 01, 2017
CNY (¥)
 [1]
Disclosure of detailed information about intangible assets [line items]                
Intangible asset, carrying amount   ¥ 10,122,000 [1] ¥ 50,122,000     $ 30,792 ¥ 206,001,000 ¥ 50,122,000
Impairment charge   ¥ 40,000,000            
Pre-tax discount rate 13.96%              
Estimated revenue growth rate 5.00%              
Pre-tax discount rate that would result in an impairment   14.82%       14.28% 14.28%  
Increase decrease in impairment charge ¥ 0.033              
Estimation of future business projection 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. Management has assessed the useful life of the development costs to be 10 years commencing from 2020, the year which National VI and Tier 4 emission standards are expected to be implemented.              
Pre-tax discount rate applied to cash flow projection           26.30% 26.30%  
Technology development cost [member]                
Disclosure of detailed information about intangible assets [line items]                
Intangible asset, carrying amount           $ 29,300 ¥ 195,900,000  
Jining Yuchai Engine Company Limited [member]                
Disclosure of detailed information about intangible assets [line items]                
Intangible asset, carrying amount   ¥ 10,100,000 0          
Impairment charge ¥ 0 ¥ 40,000,000 ¥ 0 ¥ 26,700,000 ¥ 60,000,000      
Expected useful life of intangible assets   Expected useful life of the intangible assets from 15 years to 10 years            
Pre-tax discount rate   13.69%            
Intangible assets life forecast   10 years            
Description of commercial deployment of business   The revised business plan projected 6 years, year 2023 to reach the commercial deployment of the technology. The revenue growth rate is estimated at 15.6% in 2023 and thereafter management assumed no revenue growth from 2024 to 2027.            
Estimated revenue growth rate   15.60%            
Pre-tax discount rate that would result in an impairment           1.00% 1.00%  
Increase decrease in impairment charge   ¥ 6,700,000            
[1] Restated