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Trade and Other Receivables - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
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 $ 190,200 ¥ 1,272,400,000 ¥ 1,505,800,000
Outstanding bills receivable endorsed to suppliers with recourse obligation 243,300 1,627,500,000 1,316,100,000
Gross trade receivables 65,557 438,586,000 255,879,000
Unsecured loans [member]      
Disclosure of trade and other receivables [line items]      
Non-trade receivable due from joint ventures $ 7,500 ¥ 50,000,000 0
Unsecured interest rate 4.35% 4.35%  
Dongfeng companies [member]      
Disclosure of trade and other receivables [line items]      
Gross trade receivables $ 8,100 ¥ 54,100,000 ¥ 24,600,000
Top of range [member]      
Disclosure of trade and other receivables [line items]      
Bills receivables discounted maturity period 12 months