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Borrowings - Summary of Bills Payable (Parenthetical) (Detail) | 12 Months Ended |
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Dec. 31, 2019 | Dec. 31, 2018
China Bills Finance Corporation [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual interest rates |  | 0.99%
Borrowings maturity | February and March 2021 |
China Bills Finance Corporation [member] | Bottom of range [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual interest rates | 1.02% |
China Bills Finance Corporation [member] | Top of range [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual interest rates | 1.05% |
International Bills Finance Corporation [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual interest rates |  | 1.00%
Borrowings maturity | March 2021 |
International Bills Finance Corporation [member] | Bottom of range [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual interest rates | 1.02% |
International Bills Finance Corporation [member] | Top of range [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual interest rates | 1.05% |
Ta Ching Bills Finance Corporation [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual interest rates |  | 0.98%
Borrowings maturity | January 2021 to March 2022 |
Ta Ching Bills Finance Corporation [member] | Bottom of range [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual interest rates | 1.01% |
Ta Ching Bills Finance Corporation [member] | Top of range [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual interest rates | 1.03% |
Mega Bills Finance Corporation [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual interest rates | 1.04% |
Borrowings maturity | March 2022 |

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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 2019-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard -URIDate 2019-03-27 + Details
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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 2019-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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