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Segment Information - Summary of Segment Information (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2018
CNY (¥)
Jan. 01, 2017
CNY (¥)
 [1]
Revenue            
Total external revenue $ 2,430,942 ¥ 16,263,248 ¥ 16,197,819 [1] ¥ 13,643,195 [1]    
Results            
Interest income 22,009 147,244 105,421 56,983    
Interest expense (16,194) (108,339) (96,072) (75,131)    
Gain on disposal of subsidiaries     216,115      
Gain on disposal of joint venture   107,976 [1]      
Impairment of property, plant and equipment (4,510) (30,173) (20,845) [1] (3,297) [1]    
Impairment of technology development cost     (40,000)      
Staff severance cost (4,188) (28,018) (107,732) (12,864)    
Depreciation and amortization (64,855) (433,885) (444,181) (478,160)    
Share of profit/(loss) of associates and joint ventures, net of tax 1,739 11,634 10,054 [1] (3,612) [1]    
Income tax expense (30,891) (206,667) (194,172) [1] (160,270) [1]    
Segment profit after tax 145,647 974,400 1,319,856 [1] 735,962 [1]    
Total assets 3,237,315   21,015,059 [1]   ¥ 21,657,964 ¥ 18,515,746
Total liabilities (1,571,039)   (10,053,155) [1]   (10,510,410) ¥ (8,462,092)
Other disclosures            
Investment in joint ventures 33,305   196,102   222,812  
Capital expenditure $ 60,671 405,895 261,433      
Operating segments [member] | Yuchai segment [member]            
Revenue            
Total external revenue   16,210,467 16,140,622 13,576,842    
Results            
Interest income   124,653 94,760 51,235    
Interest expense   (107,609) (94,794) (73,028)    
Impairment of property, plant and equipment   (30,173) (20,845) (3,297)    
Impairment of technology development cost     (40,000)      
Staff severance cost   (28,018) (107,732) (12,864)    
Depreciation and amortization   (428,199) (433,921) (467,177)    
Share of profit/(loss) of associates and joint ventures, net of tax   10,809 9,255 112    
Income tax expense   (175,956) (164,578) (141,272)    
Segment profit after tax   1,019,776 1,004,019 777,393    
Total assets     19,623,882   20,636,155  
Total liabilities     (9,857,637)   (10,318,492)  
Other disclosures            
Investment in joint ventures     193,476   220,176  
Capital expenditure   403,179 259,068      
Operating segments [member] | HL Global Enterprises Limited segment [member]            
Revenue            
Total external revenue   52,781 57,197 66,353    
Results            
Interest income   4,244 1,803 1,919    
Interest expense   (403) (3,983) (7,706)    
Gain on disposal of subsidiaries     216,115      
Gain on disposal of joint venture     107,976      
Depreciation and amortization   (5,355) (9,990) (10,744)    
Share of profit/(loss) of associates and joint ventures, net of tax   825 799 (3,724)    
Income tax expense   (820) (461) (2,281)    
Segment profit after tax   4,156 322,160 (4,548)    
Total assets     451,096   441,040  
Total liabilities     (66,920)   (55,404)  
Other disclosures            
Investment in joint ventures     2,626   2,636  
Capital expenditure   2,643 975      
Operating segments [member] | Corporate segment [member]            
Results            
Interest income   18,347 11,833 10,080    
Interest expense   (327) (270) (648)    
Depreciation and amortization   (331) (270) (239)    
Income tax expense   (49) (102) (89)    
Segment profit after tax   (19,690) 22,708 (20,255)    
Total assets     2,440,532   2,081,220  
Total liabilities     (28,026)   (29,592)  
Other disclosures            
Capital expenditure   73 1,390      
Elimination of intersegment amounts [member]            
Results            
Interest income     (2,975) (6,251)    
Interest expense     2,975 6,251    
Income tax expense   (29,842) (29,031) (16,628)    
Segment profit after tax   ¥ (29,842) (29,031) ¥ (16,628)    
Total assets     (1,500,451)   (1,500,451)  
Total liabilities     ¥ (100,572)   ¥ (106,922)  
[1] Restated