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Basis of Preparation and Accounting Policies - Additional Information (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
CNY (¥)
Hours
mi
Mar. 31, 2020
¥ / $
Dec. 31, 2019
USD ($)
Jan. 01, 2019
CNY (¥)
Jan. 01, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Disclosure of Summary of Significant Accounting Policies [Line items]            
Convenience translation exchange rate per US$1.00 | ¥ / $   7.0851        
Estimated useful lives of the investment properties 30 years          
Right-of-use assets ¥ 415,384   $ 58,628      
Lease liabilities 60,007   8,469 ¥ 96,852 $ 13,670  
Other liabilities ¥ 999   $ 141     ¥ 48
IFRS 16 [member]            
Disclosure of Summary of Significant Accounting Policies [Line items]            
Prepaid operating leases       367,100 51,800  
Trade and other receivables       1,800 300  
Trade and other payables       19,100 2,700  
Increase decrease due to application of IFRS 16 [Member] | IFRS 16 [member]            
Disclosure of Summary of Significant Accounting Policies [Line items]            
Right-of-use assets       446,600 63,000  
Finance lease assets recognized       40 10  
Lease liabilities       96,900 13,700  
Other liabilities       ¥ 50 $ 10  
Bottom of range [member]            
Disclosure of Summary of Significant Accounting Policies [Line items]            
Lease term 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          
Warranty mileage | mi 50,000          
Bottom of range [member] | Other Applications Engines [member]            
Disclosure of Summary of Significant Accounting Policies [Line items]            
Warranty claim period 12 months          
Product warranty running hours | Hours 1,000          
Top of range [member]            
Disclosure of Summary of Significant Accounting Policies [Line items]            
Lease term 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          
Warranty mileage | mi 360,000          
Top of range [member] | Other Applications Engines [member]            
Disclosure of Summary of Significant Accounting Policies [Line items]            
Warranty claim period 28 months          
Product warranty running hours | Hours 3,500