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Financial Instruments - Summary of Detailed Information about Maturity Analysis of Obligation under Leases (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($)
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Less than 1 year [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | $ 929,832 | $ 33,519 | $ 875,563
1-5 years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 158,925,804 | 5,729,121 | 151,252,482
1-5 years [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 2,585,624 | 93,209 | 1,779,041
5 to 10 Years [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 1,731,995 | 62,437 | 1,422,331
10 to 15 Years [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 883,335 | 31,843 | 776,735
15 to 20 Years [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 802,765 | 28,939 | 674,446
More than 20 Years [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | $ 1,511,507 | $ 54,488 | $ 1,214,789

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