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Investment Properties - Summary of Investment Properties (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Disclosure of detailed information about investment property [line items] |  |  |
Beginning balance |  | $ 8,119,436 |
Depreciation expenses | $ 12,828 | 392,667 | $ 122,231
Ending balance | 252,806 | 7,738,379 | 8,119,436
Land [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Beginning balance |  | 35,965 |
Ending balance | 1,175 | 35,965 | 35,965
Buildings and improvements [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Beginning balance |  | 8,083,471 |
Ending balance | 251,631 | 7,702,414 | 8,083,471
Cost [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Beginning balance | 275,817 | 8,442,750 |
Additions | 4,111 | 125,853 | 186,535
Disposals |  |  | (342)
Transferred from inventories related to real estate business and property, plant and equipment | 487 | 14,891 | 8,150,075
Effects of foreign currency exchange differences | (4,500) | (137,739) | 106,482
Ending balance | 275,915 | 8,445,755 | 8,442,750
Cost [member] | Land [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Beginning balance | 1,175 | 35,965 |
Transferred from inventories related to real estate business and property, plant and equipment |  |  | 35,965
Ending balance | 1,175 | 35,965 | 35,965
Cost [member] | Buildings and improvements [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Beginning balance | 274,642 | 8,406,785 |
Additions | 4,111 | 125,853 | 186,535
Disposals |  |  | (342)
Transferred from inventories related to real estate business and property, plant and equipment | 487 | 14,891 | 8,114,110
Effects of foreign currency exchange differences | (4,500) | (137,739) | 106,482
Ending balance | 274,740 | 8,409,790 | 8,406,785
Accumulated depreciation, amortisation and impairment [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Beginning balance | 10,562 | 323,314 |
Depreciation expenses | 12,828 | 392,667 | 122,231
Disposals |  |  | (161)
Transferred from inventories related to real estate business and property, plant and equipment | 9 | 265 | 199,745
Effects of foreign currency exchange differences | (290) | (8,870) | 1,499
Ending balance | 23,109 | 707,376 | 323,314
Accumulated depreciation, amortisation and impairment [member] | Buildings and improvements [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Beginning balance | 10,562 | 323,314 |
Depreciation expenses | 12,828 | 392,667 | 122,231
Disposals |  |  | (161)
Transferred from inventories related to real estate business and property, plant and equipment | 9 | 265 | 199,745
Effects of foreign currency exchange differences | (290) | (8,870) | 1,499
Ending balance | $ 23,109 | $ 707,376 | $ 323,314

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- Definition The increase in investment property resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2018-01-01 -Paragraph 76 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2018-03-01&anchor=para_76_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2018-03-01&anchor=para_79_d_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of depreciation recognised on investment property. [Refer: Depreciation and amortisation expense; Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph d -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2018-03-01&anchor=para_79_d_iv&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2018-01-01 -Paragraph 76 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2018-03-01&anchor=para_76&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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- Definition The decrease in investment property resulting from disposals. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2018-01-01 -Paragraph 76 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2018-03-01&anchor=para_76_c&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2018-03-01&anchor=para_79_d_iii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in investment property resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2018-01-01 -Paragraph 76 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2018-03-01&anchor=para_76_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph d -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2018-03-01&anchor=para_79_d_vi&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Expiry date 2019-01-01: The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee under a finance lease) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business. Effective 2019-01-01: The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee as a right-of-use asset) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2018-01-01 -Paragraph 76 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2018-03-01&anchor=para_76&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2018-03-01&anchor=para_79_d&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_b&doctype=Standard -URIDate 2018-03-16 + Details
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