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Intangible Assets - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2017
USD ($)
Disclosure of detailed information about intangible assets [Line Items]            
Intangible asset, carrying amount ¥ 10,122,000   ¥ 81,826,000     $ 1,599
Impairment charge ¥ 40,000,000 $ 6,320 ¥ 0 ¥ 26,700,000    
Projected cash flows forecast period 10 years 10 years 15 years      
Projected cash flows forecast period for growth rate 6 years 6 years 5 years      
Revenue growth rate 6.50%   6.50%     6.50%
Later Than One Year And Not Later Than Fifteen Year [member]            
Disclosure of detailed information about intangible assets [Line Items]            
Pre-tax discount rate 13.69%         13.69%
Later Than One Year And Not Later Than Ten Year [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Pre-tax discount rate     12.98%      
Sixth Year [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Revenue growth rate 15.60%   6.70%     15.60%
Later than six years and not later than fifteen years [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Revenue growth rate 0.00%   0.00%     0.00%
Technology development cost [member]            
Disclosure of detailed information about intangible assets [Line Items]            
Impairment charge       ¥ 26,700,000 ¥ 60,000,000  
Jining Yuchai Engine Company Limited [Member] | One Percent Increase in Discount Rate [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Impairment charge ¥ 6,731,000 $ 1,063 ¥ 2,443,000      
Jining Yuchai Engine Company Limited [Member] | Technology development cost [member]            
Disclosure of detailed information about intangible assets [Line Items]            
Intangible asset, carrying amount 10,122,000   ¥ 50,122,000     $ 1,599
Impairment charge ¥ 40,000,000 $ 6,320        
Jining Yuchai Engine Company Limited [Member] | Technology development cost [member] | Bottom of range [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Expected useful life of intangible assets 10 years 10 years        
Jining Yuchai Engine Company Limited [Member] | Technology development cost [member] | Top of range [Member]            
Disclosure of detailed information about intangible assets [Line Items]            
Expected useful life of intangible assets 15 years 15 years