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Trade and Other Receivables - Additional Information (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
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 ¥ 2,268,400 $ 320,200 ¥ 1,272,400
Outstanding bills receivable endorsed to suppliers with recourse obligation 1,120,300 158,100 1,627,500
Gross trade receivables 794,678 112,161 438,586
Unsecured loans [member]      
Disclosure of trade and other receivables [line items]      
Non-trade receivable due from joint ventures     ¥ 50,000
Unsecured interest rate     4.35%
Dongfeng companies [member]      
Disclosure of trade and other receivables [line items]      
Gross trade receivables ¥ 136,400 $ 19,200 ¥ 54,100
Top of range [member]      
Disclosure of trade and other receivables [line items]      
Bills receivables discounted maturity period 12 months