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Significant Contingent Liabilities and Unrecognized Commitments - Additional Information (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2013 TWD ($) | Feb. 28, 2019 USD ($) | Feb. 28, 2019 TWD ($) | Dec. 31, 2018 TWD ($)
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |
Unused letters of credit | $ 20,712 |  | $ 20,000 |  |  |  | $ 634,000
Committed to purchase property, plant and equipment | 556,663 |  | 7,019,377 |  |  |  | $ 17,039,458
Prepayment of property, plant and equipment | 76,423 | $ 2,339,308 | 294,194 |  |  |  |
Construction contract related to real estate business | $ 29,012 | $ 888,052 | $ 1,548,806 |  |  |  |
Announcing or commencing implementation of major restructuring [member] |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |
Contribution to be made for environmental protection |  |  |  |  | $ 3,267 | $ 100,000 |
Taiwan [member] |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |
Contractual period for environmental protection |  |  |  | 30 years |  |  |
Contribution to be made for environmental protection |  |  |  | $ 3,000,000 |  |  |

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- Definition The amount of provision for costs related to decommissioning, restoration and rehabilitation. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Section D Examples: disclosures -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=sect_DExamples:disclosures&doctype=Illustrative%20Examples -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 87 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_87&doctype=Standard -URIDate 2018-03-16 + Details
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