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Financial Instruments - Summary of Maturity Analysis for Non-derivative Financial Liabilities (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($)
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Less than 1 month [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | $ 81,774,799 | $ 2,493,894 | $ 84,501,335
Less than 1 month [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 167,887 | 5,120 | 123,436
Less than 1 month [member] | Non interest bearing [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 66,577,698 | 2,030,427 | 52,472,703
Less than 1 month [member] | Floating interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 9,865,888 | 300,881 | 19,534,908
Less than 1 month [member] | Fixed interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 5,163,326 | 157,466 | 12,370,288
1 to 3 months [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 66,802,249 | 2,037,275 | 66,640,052
1 to 3 months [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 185,848 | 5,668 | 219,960
1 to 3 months [member] | Non interest bearing [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 39,954,390 | 1,218,493 | 33,530,541
1 to 3 months [member] | Floating interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 15,650,230 | 477,287 | 9,967,914
1 to 3 months [member] | Fixed interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 11,011,781 | 335,827 | 22,921,637
3 months to 1 year [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 48,783,130 | 1,487,744 | 35,297,943
3 months to 1 year [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 801,002 | 24,428 | 884,309
3 months to 1 year [member] | Non interest bearing [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 18,126,780 | 552,814 | 13,672,318
3 months to 1 year [member] | Floating interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 13,152,601 | 401,116 | 9,505,587
3 months to 1 year [member] | Fixed interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 16,702,747 | 509,386 | 11,235,729
1-5 years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 146,133,980 | 4,456,663 | 106,829,736
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 | 2,676,514 | 81,626 | 2,867,502
1-5 years [member] | Non interest bearing [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 4,707,506 | 143,565 | 4,478,467
1-5 years [member] | Floating interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 115,539,867 | 3,523,631 | 78,388,027
1-5 years [member] | Fixed interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 23,210,093 | 707,841 | 21,095,740
More than 5 years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 14,644,683 | 446,621 | 14,373,773
More than 5 years [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 5,572,038 | 169,931 | 5,505,095
More than 5 years [member] | Non interest bearing [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 1,177,870 | 35,922 | 83,594
More than 5 years [member] | Floating interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | $ 7,894,775 | $ 240,768 | $ 8,785,084

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