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Investment Properties - Summary of Maturity Analysis Of Operating Lease Payments (Detail) - Dec. 31, 2019 $ in Thousands, $ in Thousands | TWD ($) | USD ($)
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Disclosure of detailed information about investment property [line items] |  |
Undiscounted operating lease payments to be received | $ 3,848,677 | $ 128,675
Year 1 [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Undiscounted operating lease payments to be received | 921,649 | 30,814
Year 2 [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Undiscounted operating lease payments to be received | 744,366 | 24,887
Year 3 [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Undiscounted operating lease payments to be received | 623,326 | 20,840
Year 4 [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Undiscounted operating lease payments to be received | 408,634 | 13,662
Year 5 [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Undiscounted operating lease payments to be received | 320,611 | 10,719
Year 6 onwards [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Undiscounted operating lease payments to be received | $ 830,091 | $ 27,753

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- Definition The amount of undiscounted operating lease payments to be received. Operating lease is a lease that does not transfer substantially all the risks and rewards incidental to ownership of an underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 97 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_97&doctype=Standard -URIDate 2019-03-27 + Details
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