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Basis of Preparation and Accounting Policies - Additional Information (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Jan. 01, 2019
USD ($)
Jan. 01, 2019
CNY (¥)
Jan. 01, 2018
USD ($)
Jan. 01, 2018
CNY (¥)
Jan. 01, 2017
CNY (¥)
Dec. 31, 2018
USD ($)
Hours
km
Dec. 31, 2018
CNY (¥)
Hours
km
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Feb. 28, 2019
Jan. 01, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Disclosure of Summary of Significant Accounting Policies [Line items]                        
Convenience translation exchange rate per US$1.00                   6.6901    
Estimated useful lives of the investment properties           30 years 30 years          
Percentage of shareholder interest           7.70% 7.70%          
Contract liabilities, current         ¥ 185,914 [1] $ 42,867   ¥ 198,570 [1]       ¥ 286,786
Contract liabilities, non-current         27,372 [1] 8,027   34,759 [1]       ¥ 53,703
Other operating income           $ 30,663 ¥ 205,143 532,117 [1] ¥ 117,954 [1]      
Increase (decrease) due to application of IFRS 15 [member]                        
Disclosure of Summary of Significant Accounting Policies [Line items]                        
Contract liabilities, current         63,900     81,105 63,870      
Contract liabilities, non-current         27,400     34,759 27,372      
Decrease in provision for product warranty         (69,800)     (98,500)        
Increases (decrease) in retained earnings               (13,300)        
Increase (decrease) in non-controlling interests               (4,100)        
Decrease in revenue               (24,600) (21,600)      
Decrease in selling, general and distribution expenses               (163,000) (4,100)      
Increase (decrease) in cost of sales               134,300 ¥ (29,900)      
Other operating income               (115,235)        
Decrease in other operating income               (115,200)        
Decrease in tax expense               ¥ (26,000)        
Decrease in intangible assets         (31,700)              
Decrease in investment in associate and joint venture         (73,100)              
Decrease in deferred tax assets         (26,000)              
Increase in other receivables and prepayment         50,000              
Decrease in trade and other payables         (170,000)              
Increase (decrease) due to application of IFRS 15 [member] | Performance obligations [member]                        
Disclosure of Summary of Significant Accounting Policies [Line items]                        
Increases (decrease) in retained earnings         (68,200)              
Increase (decrease) in non-controlling interests         (21,100)              
IFRS 16 [member] | Entering into significant commitments or contingent liabilities [member]                        
Disclosure of Summary of Significant Accounting Policies [Line items]                        
Right-of-use assets $ 13,400                   ¥ 89,400  
Lease liabilities 16,200                   ¥ 108,300  
Decrease in prepayment (300) ¥ (1,900)                    
Decrease in accrued expense $ (3,100) ¥ (20,800)                    
IFRS9 [member]                        
Disclosure of Summary of Significant Accounting Policies [Line items]                        
Decrease in carrying value of bills receivable     $ 20,500 ¥ 137,300                
Sale of Engines With Service Type Warranties [member] | Increase (decrease) due to application of IFRS 15 [member]                        
Disclosure of Summary of Significant Accounting Policies [Line items]                        
Increases (decrease) in retained earnings         (16,300)              
Increase (decrease) in non-controlling interests         ¥ (5,000)              
Bottom of range [member]                        
Disclosure of Summary of Significant Accounting Policies [Line items]                        
Lease term           15 years 15 years          
Bottom of range [member] | On-Road Applications Engines [member]                        
Disclosure of Summary of Significant Accounting Policies [Line items]                        
Warranty claim period           12 months 12 months          
Warranty mileage | km           50,000 50,000          
Bottom of range [member] | Other Applications Engines [member]                        
Disclosure of Summary of Significant Accounting Policies [Line items]                        
Warranty claim period           12 months 12 months          
Product warranty running hours | Hours           1,000 1,000          
Top of range [member]                        
Disclosure of Summary of Significant Accounting Policies [Line items]                        
Lease term           50 years 50 years          
Top of range [member] | On-Road Applications Engines [member]                        
Disclosure of Summary of Significant Accounting Policies [Line items]                        
Warranty claim period           60 months 60 months          
Warranty mileage | km           360,000 360,000          
Top of range [member] | Other Applications Engines [member]                        
Disclosure of Summary of Significant Accounting Policies [Line items]                        
Warranty claim period           28 months 28 months          
Product warranty running hours | Hours           3,500 3,500          
[1] Restated