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Trade and Other Receivables - Additional Information (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Disclosure of trade and other receivables [line items]      
Trade receivables payment terms 60 days    
Outstanding bills receivable discounted with banks by retaining recourse obligation ¥ 2,225,100 $ 343,800 ¥ 2,268,400
Outstanding bills receivable endorsed to suppliers with recourse obligation 1,834,500 283,500 1,120,300
Gross trade receivables 332,567 51,391 794,678
Dongfeng companies [member]      
Disclosure of trade and other receivables [line items]      
Gross trade receivables ¥ 17,600 $ 2,700 ¥ 136,400
Top of range [member]      
Disclosure of trade and other receivables [line items]      
Bills receivables discounted maturity period 12 months