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v3.19.1

Profit Before Income Tax - Summary of Depreciation and Amortization (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
Analysis of income and expense [Line Items] |  |  |  |
Property, plant and equipment depreciation | $ 1,303,293 | $ 39,893,786 | $ 28,625,287 | $ 28,961,614
Investment properties | 12,828 | 392,667 | 122,231 |
Intangible assets amortization | 78,486 | 2,402,450 | 457,666 | 508,823
Depreciation and amortization | 1,394,607 | 42,688,903 | 29,205,184 | 29,470,437
Depreciation expense | 1,316,121 | 40,286,453 | 28,747,518 | 28,961,614
Operating costs [member] |  |  |  |
Analysis of income and expense [Line Items] |  |  |  |
Intangible assets amortization | 45,562 | 1,394,664 | 140,175 | 152,987
Depreciation expense | 1,238,257 | 37,903,050 | 26,731,714 | 26,948,106
Operating expenses [member] |  |  |  |
Analysis of income and expense [Line Items] |  |  |  |
Intangible assets amortization | 32,924 | 1,007,786 | 317,491 | 355,836
Depreciation expense | $ 77,864 | $ 2,383,403 | $ 2,015,804 | $ 2,013,508

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- Definition The amount of depreciation and amortisation expense. Depreciation and amortisation are the systematic allocations of depreciable amounts of assets over their useful lives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 23 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_23_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_28_e&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B13 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B13_d&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_102&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_99&doctype=Standard -URIDate 2018-03-16 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 104 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_104&doctype=Standard -URIDate 2018-03-16 + Details
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