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Trade and Other Receivables - Summary of Trade and Other Receivables (Parenthetical) (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2021
USD ($)
Disclosure of trade and other receivables [line items]        
Bills receivable ¥ 6,437,100   ¥ 7,793,343 $ 1,018,174
Impairment loss on bills receivable in transit 6,000 $ 900 6,500  
Secured bank facilities [member]        
Disclosure of trade and other receivables [line items]        
Bills receivable 13,400   0 2,100
Joint ventures [member]        
Disclosure of trade and other receivables [line items]        
Bills receivable 700   0 100
Other related parties [member]        
Disclosure of trade and other receivables [line items]        
Bills receivable ¥ 523,500   ¥ 1,014,100 $ 82,800