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Provision - Summary of Provision (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Disclosure of other provisions [line items]        
Beginning balance ¥ 269,078 $ 42,561 ¥ 218,031 $ 34,487
Provision made 296,986 46,975 349,303 55,250
Provision utilized (299,397) (47,357) (295,940) (46,810)
Provision reversed (13,639) (2,157) (2,316) (366)
Ending balance 253,028 $ 40,022 269,078 $ 42,561
Product warranty provision [member]        
Disclosure of other provisions [line items]        
Beginning balance 255,439   215,715  
Provision made 292,157   335,664  
Provision utilized (299,397)   (295,940)  
Ending balance 248,199   255,439  
Provision for onerous contract [member[        
Disclosure of other provisions [line items]        
Beginning balance 13,639   2,316  
Provision made 4,829   13,639  
Provision reversed (13,639)   (2,316)  
Ending balance ¥ 4,829   ¥ 13,639