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Corporate Information - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2017
Associate
JointVenture
Subsidiaries
shares
Dec. 31, 2016
CNY (¥)
Dec. 31, 2014
CNY (¥)
shares
Dec. 31, 2013
Dec. 31, 2012
Apr. 04, 2012
Jan. 16, 2012
shares
Jan. 13, 2012
shares
Dec. 31, 2011
Nov. 30, 2017
CNY (¥)
Oct. 31, 2016
Sep. 30, 2014
CNY (¥)
Dec. 31, 2017
CNY (¥)
Associate
JointVenture
Subsidiaries
shares
Dec. 31, 2017
USD ($)
Associate
JointVenture
Subsidiaries
shares
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
shares
Dec. 31, 2014
CNY (¥)
shares
Dec. 31, 1994
$ / shares
Disclosure of Corporate Information [Line Items]                                    
Number of indirectly owned subsidiaries | Subsidiaries 33                       33 33        
Number of directly owned subsidiaries | Subsidiaries 9                       9 9        
Number of joint ventures | JointVenture 3                       3 3        
Number of associate | Associate 1                       1 1        
Additional investment in subsidiaries                         ¥ 8,279,000 $ 1,308 ¥ 9,076,000 ¥ 22,499,000    
Jining Yuchai Engine Company Limited [Member]                                    
Disclosure of Corporate Information [Line Items]                                    
Percentage of ownership interest transferred                       70.00%            
Consideration paid | ¥                       ¥ 1.00            
Irrevocable option to acquire | ¥   ¥ 250,000                         ¥ 250,000      
Management agreement term                                 One year  
Management fee per annum | ¥                                 ¥ 240,000  
Management agreement term renewed                     One more year              
Jining Yuchai Engine Company Limited [Member] | Guangxi Yulin Hotel Company Limited [Member]                                    
Disclosure of Corporate Information [Line Items]                                    
Loan tenure                                 Two year  
Jining Yuchai Engine Company Limited [Member] | Guangxi Yulin Hotel Company Limited [Member] | Top of range [Member]                                    
Disclosure of Corporate Information [Line Items]                                    
Principal loan amount | ¥     ¥ 70,000,000                           ¥ 70,000,000  
Jining Yuchai Engine Company Limited [Member] | Zhejiang Geely Holding Group Co Ltd [member]                                    
Disclosure of Corporate Information [Line Items]                                    
Percentage of ownership interest transferred to third party                       30.00%            
HL Global Enterprises Limited [Member]                                    
Disclosure of Corporate Information [Line Items]                                    
Ownership interest in subsidiary     50.20% 50.10% 50.10% 48.90% 48.10%   49.40%             50.20%    
Number of preference shares transferred               24,189,170                    
Percentage of unconverted preference shares transfer to trustee               100.00%                    
Conversion of convertible preference shares into ordinary shares             24,189,170                      
Number of shares purchased in open market     465,000                           465,000  
Number of ordinary shares exercise to consolidation                               10    
Number of ordinary shares exercised into consolidation                               1    
Number of ordinary shares held upon completion of consolidation exercise                               47,107,707    
Percentage of voting power held in subsidiary 50.20% 50.20%                                
Yuchai [Member] | Jining Yuchai Engine Company Limited [Member]                                    
Disclosure of Corporate Information [Line Items]                                    
Additional investment in subsidiaries | ¥                   ¥ 250,000                
Diesel Machinery (BVI) Limited [member] | Special Share [member]                                    
Disclosure of Corporate Information [Line Items]                                    
Par value | $ / shares                                   $ 0.10
Foreign Shares of Yuchai [member]                                    
Disclosure of Corporate Information [Line Items]                                    
Number of shares owned by entity 361,420,150                       361,420,150 361,420,150        
Percentage of issued share capital held by group                         76.41% 76.41%        
Number of wholly owned subsidiaries                         6 6        
Guangxi Yuchai Machinery Group Company Limited [member]                                    
Disclosure of Corporate Information [Line Items]                                    
Percentage of issued share capital held by group                         22.09% 22.09%        
Guangxi Yuchai Machinery Monopoly Development Company Limited [Member]                                    
Disclosure of Corporate Information [Line Items]                                    
Number of wholly owned subsidiaries | Subsidiaries                         30 30        
Ownership interest in subsidiary                         54.90% 54.90% 54.90%      
Guangxi Yuchai Accessories Manufacturing Company Limited [Member]                                    
Disclosure of Corporate Information [Line Items]                                    
Number of wholly owned subsidiaries | Subsidiaries                         1 1        
Ownership interest in subsidiary                         76.40% 76.40% 76.40%