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Borrowings - Additional Information (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term bills payable | $ 10,895,365 |  | $ 364,272 | $ 3,099,232
Current portion of noncurrent bills issued | 94,798 |  | 3,169 |
Unamortized discounts [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Long-term bills payable | 4,635 |  | $ 155 | $ 768
Borrowings From Leasing Companies [Member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Funding from subsidiaries | $ 100,016 | $ 3,344 |  |
Borrowings maturity | February 2021 | February 2021 |  |
Borrowings From Leasing Companies [Member] | Bottom of range [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual interest rates | 5.02% |  | 5.02% |
Borrowings From Leasing Companies [Member] | Top of range [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual interest rates | 6.89% |  | 6.89% |
Short Term Unsecured Revolving Bank Loan And Letters Of Credit [Member] | Bottom of range [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual interest rates | 0.70% |  | 0.70% | 0.76%
Short Term Unsecured Revolving Bank Loan And Letters Of Credit [Member] | Top of range [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual interest rates | 5.40% |  | 5.40% | 5.10%

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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 cash inflow from borrowings obtained. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 17 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_17_c&doctype=Standard -URIDate 2019-03-27 + Details
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