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Trade and Bills Receivables - Summary of Trade and Bills Receivables (Parenthetical) (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Disclosure of financial assets [Line Items]      
Bills receivable ¥ 6,819,440 $ 1,077,423 ¥ 6,816,088
Joint Ventures [Member]      
Disclosure of financial assets [Line Items]      
Bills receivable 69,816 11,030 45,000
Other related parties [Member]      
Disclosure of financial assets [Line Items]      
Bills receivable ¥ 23,832 $ 3,765 ¥ 3,968