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Borrowings - Summary of Long-term Bills Payable (Parenthetical) (Detail) | 12 Months Ended |
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Dec. 31, 2018 | Dec. 31, 2017
China Bills Finance Corporation [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual interest rates | 0.99% | 0.96%
Borrowings maturity | February 2020 |
International Bills Finance Corporation [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual interest rates | 1.00% | 0.96%
Borrowings maturity | March 2020 |
Ta Ching Bills Finance Corporation [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual interest rates | 0.98% |
Borrowings maturity | January 2020 |

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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
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Period Type: | instant

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- Definition The maturity of borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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