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Trade and Bills Receivables - Age Analysis of Trade and Bills Receivables (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Age Analysis of Trade and Bills Receivables [Line Items]      
Trade and bills receivables ¥ 7,031,544 $ 1,110,934 ¥ 7,057,256
Financial assets neither past due nor impaired [Member]      
Age Analysis of Trade and Bills Receivables [Line Items]      
Trade and bills receivables 6,919,347   6,995,511
Financial assets past due but not impaired [Member] | 0 - 90 days [Member]      
Age Analysis of Trade and Bills Receivables [Line Items]      
Trade and bills receivables 59,966   37,902
Financial assets past due but not impaired [Member] | 91 - 180 days [Member]      
Age Analysis of Trade and Bills Receivables [Line Items]      
Trade and bills receivables 21,457   12,062
Financial assets past due but not impaired [Member] | 181 - 365 days [Member]      
Age Analysis of Trade and Bills Receivables [Line Items]      
Trade and bills receivables 29,857   9,654
Financial assets past due but not impaired [Member] | Later than one year [Member]      
Age Analysis of Trade and Bills Receivables [Line Items]      
Trade and bills receivables ¥ 917   ¥ 2,127