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Provision - Summary of Provision (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Disclosure of other provisions [line items]        
Beginning balance ¥ 218,031 $ 33,692 ¥ 166,913 $ 25,793
Provision made 349,303 53,977 424,221 65,554
Provision utilized (295,940) (45,731) (373,103) (57,655)
Provision reversed (2,316) (358)    
Ending balance 269,078 $ 41,580 218,031 $ 33,692
Product warranty provision [member]        
Disclosure of other provisions [line items]        
Beginning balance 215,715   166,913  
Provision made 335,664   421,905  
Provision utilized (295,940)   (373,103)  
Ending balance 255,439   215,715  
Provision for onerous contract [member[        
Disclosure of other provisions [line items]        
Beginning balance 2,316      
Provision made 13,639   2,316  
Provision reversed (2,316)      
Ending balance ¥ 13,639   ¥ 2,316