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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

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