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Trade and Other Receivables - Additional Information (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Disclosure of trade and other receivables [line items]      
Outstanding bills receivable discounted with banks by retaining recourse obligation ¥ 79,100 $ 12,500 ¥ 2,225,100
Outstanding bills receivable endorsed to suppliers with recourse obligation 2,550,000 403,300 1,834,500
Gross trade receivables 557,767 88,224 332,567
Dongfeng companies [member]      
Disclosure of trade and other receivables [line items]      
Gross trade receivables ¥ 65,700 $ 10,400 ¥ 17,600
Top of range [member]      
Disclosure of trade and other receivables [line items]      
Trade receivables payment terms 90 days    
Bills receivables discounted maturity period 12 months    
Bottom of range [member]      
Disclosure of trade and other receivables [line items]      
Trade receivables payment terms 60 days