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v3.20.1

Investment Properties - Summary of Investment Properties (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Disclosure of detailed information about investment property [line items] |  |  |  |
Beginning balance | $ 7,738,379 |  | $ 8,119,436 |
Depreciation expenses | 594,110 | $ 19,863 | 392,667 | $ 122,231
Ending balance | 12,854,071 | 429,758 | 7,738,379 | 8,119,436
Land [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Beginning balance | 35,965 |  | 35,965 |
Ending balance | 35,965 | 1,202 | 35,965 | 35,965
Buildings and improvements [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Beginning balance | 7,702,414 |  | 8,083,471 |
Ending balance | 6,737,798 | 225,269 | 7,702,414 | 8,083,471
Right-of-use assets [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Ending balance | 6,080,308 | 203,287 |  |
Cost [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Beginning balance | 15,337,702 | 512,795 | 8,442,750 |
Additions | 2,532 | 85 | 125,853 | 186,535
Disposals | (1,843) | (62) |  | (342)
Reclassification | (511,199) | (17,091) | 14,891 | 8,150,075
Effects of foreign currency exchange differences | (513,066) | (17,153) | (137,739) | 106,482
Ending balance | 14,314,126 | 478,574 | 15,337,702 | 8,442,750
Cost [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Beginning balance | 8,445,755 | 282,372 |  |
Ending balance |  |  | 8,445,755 |
Cost [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Beginning balance | 6,891,947 | 230,423 |  |
Ending balance |  |  | 6,891,947 |
Cost [member] | Land [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Beginning balance | 35,965 | 1,202 | 35,965 |
Reclassification |  |  |  | 35,965
Ending balance | 35,965 | 1,202 | 35,965 | 35,965
Cost [member] | Land [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Beginning balance | 35,965 | 1,202 |  |
Ending balance |  |  | 35,965 |
Cost [member] | Buildings and improvements [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Beginning balance | 8,409,790 | 281,170 | 8,406,785 |
Additions | 2,532 | 85 | 125,853 | 186,535
Disposals | (1,843) | (62) |  | (342)
Reclassification | (490,130) | (16,387) | 14,891 | 8,114,110
Effects of foreign currency exchange differences | (209,980) | (7,020) | (137,739) | 106,482
Ending balance | 7,710,369 | 257,786 | 8,409,790 | 8,406,785
Cost [member] | Buildings and improvements [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Beginning balance | 8,409,790 | 281,170 |  |
Ending balance |  |  | 8,409,790 |
Cost [member] | Right-of-use assets [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Beginning balance | 6,891,947 | 230,423 |  |
Reclassification | (21,069) | (704) |  |
Effects of foreign currency exchange differences | (303,086) | (10,133) |  |
Ending balance | 6,567,792 | 219,586 | 6,891,947 |
Cost [member] | Right-of-use assets [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Beginning balance | 6,891,947 | 230,423 |  |
Ending balance |  |  | 6,891,947 |
Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Beginning balance | 1,000,098 | 33,437 | 323,314 |
Depreciation expenses | 594,110 | 19,863 | 392,667 | 122,231
Disposals | (1,240) | (41) |  | (161)
Reclassification | (209,912) | (7,018) | 265 | 199,745
Effects of foreign currency exchange differences | 76,999 | 2,575 | (8,870) | 1,499
Ending balance | 1,460,055 | 48,816 | 1,000,098 | 323,314
Accumulated depreciation, amortisation and impairment [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Beginning balance | 707,376 | 23,650 |  |
Ending balance |  |  | 707,376 |
Accumulated depreciation, amortisation and impairment [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Beginning balance | 292,722 | 9,787 |  |
Ending balance |  |  | 292,722 |
Accumulated depreciation, amortisation and impairment [member] | Buildings and improvements [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Beginning balance | 707,376 | 23,650 | 323,314 |
Depreciation expenses | 377,536 | 12,622 | 392,667 | 122,231
Disposals | (1,240) | (41) |  | (161)
Reclassification | (210,455) | (7,036) | 265 | 199,745
Effects of foreign currency exchange differences | 99,354 | 3,322 | (8,870) | 1,499
Ending balance | 972,571 | 32,517 | 707,376 | $ 323,314
Accumulated depreciation, amortisation and impairment [member] | Buildings and improvements [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Beginning balance | 707,376 | 23,650 |  |
Ending balance |  |  | 707,376 |
Accumulated depreciation, amortisation and impairment [member] | Right-of-use assets [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Beginning balance | 292,722 | 9,787 |  |
Depreciation expenses | 216,574 | 7,241 |  |
Reclassification | 543 | 18 |  |
Effects of foreign currency exchange differences | (22,355) | (747) |  |
Ending balance | 487,484 | 16,299 | 292,722 |
Accumulated depreciation, amortisation and impairment [member] | Right-of-use assets [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Beginning balance | $ 292,722 | $ 9,787 |  |
Ending balance |  |  | $ 292,722 |

X
- 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 2019-01-01 -Paragraph 76 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2019-en-r&anchor=para_76_b&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2019-01-01 -Paragraph 79 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2019-en-r&anchor=para_79_d_ii&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 76 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2019-en-r&anchor=para_76_c&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2019-01-01 -Paragraph 79 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2019-en-r&anchor=para_79_d_iii&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 76 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2019-en-r&anchor=para_76_e&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2019-01-01 -Paragraph 79 -Subparagraph d -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2019-en-r&anchor=para_79_d_vi&doctype=Standard -URIDate 2019-03-27 + Details
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