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Financial Instruments - Summary of Fair Value of Financial Instruments that are Measured at Fair Value on a Recurring Basis (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($)
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Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | $ 10,832,042 | $ 330,346 | $ 6,628,690
Unsecured cumulative subordinate corporate bonds | 1,025,760 | 31,283 | 1,042,906
Trade receivables, net | 6,532,508 | 199,222 | 5,637,485
Financial assets at FVTOCI | 20,492,001 | 624,946 | 7,301,222
Financial liabilities at FVTPL | 832,869 | 25,399 | 1,302,342
Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities at FVTPL | 243,752 | 7,433 | 1,302,342
Swap contracts [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 4,282,512 | 130,604 | 1,453,868
Financial liabilities at FVTPL | 179,967 | 5,488 | 1,183,469
Forward exchange contracts [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 258,362 | 7,879 | 161,924
Financial liabilities at FVTPL | 63,785 | 1,945 | 118,873
Quoted ordinary shares [member] | Non-derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 2,898,751 | 88,404 | 2,099,844
Private-placement funds [member] | Non-derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 1,503,382 | 45,849 | 1,796,015
Unquoted preferred shares [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTOCI, Investments in equity instruments | 14,808 | 452 | 13,303
Unquoted preferred shares [member] | Non-derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 863,484 | 26,334 | 747,960
Open-end mutual funds [member] | Non-derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 590,346 | 18,004 | 307,669
Hybrid financial assets Convertible notes [member] | Non-derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL |  |  | 61,410
Convertible notes [member] | Hybrid financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 360,635 | 10,998 |
Preferred shares with warrants [member] | Hybrid financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 65,570 | 2,000 |
Documentary investment agreement [member] | Hybrid financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 9,000 | 274 | 0
Unquoted ordinary shares [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTOCI, Investments in equity instruments | 12,846,151 | 391,770 | 607,528
Unquoted ordinary shares [member] | Non-derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 863,484 | 26,334 | 747,960
TIB quoted ordinary shares [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTOCI, Investments in equity instruments | 72,774 | 2,219 |
Contingent considerations [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities at FVTPL | 589,117 | 17,966 |
Contingent considerations [member] | Non-derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities at FVTPL | 589,117 | 17,966 | 0
Level 1 of fair value hierarchy [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 3,489,097 | 106,408 | 2,407,513
Financial assets at FVTOCI | 72,774 | 2,219 |
Level 1 of fair value hierarchy [member] | Forward exchange contracts [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 0 |  |
Level 1 of fair value hierarchy [member] | Quoted ordinary shares [member] | Non-derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 2,898,751 | 88,404 | 2,099,844
Level 1 of fair value hierarchy [member] | Open-end mutual funds [member] | Non-derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 590,346 | 18,004 | 307,669
Level 1 of fair value hierarchy [member] | TIB quoted ordinary shares [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTOCI, Investments in equity instruments | 72,774 | 2,219 |
Level 2 of fair value hierarchy [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 4,540,874 | 138,483 | 1,615,792
Financial liabilities at FVTPL | 243,752 | 7,433 | 1,302,342
Level 2 of fair value hierarchy [Member] | Swap contracts [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 4,282,512 | 130,604 | 1,453,868
Financial liabilities at FVTPL | 179,967 | 5,488 | 1,183,469
Level 2 of fair value hierarchy [Member] | Forward exchange contracts [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 258,362 | 7,879 | 161,924
Financial liabilities at FVTPL | 63,785 | 1,945 | 118,873
Level 3 of fair value hierarchy [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 2,802,071 | 85,455 | 2,605,385
Unsecured cumulative subordinate corporate bonds | 1,025,760 | 31,283 | 1,042,906
Trade receivables, net | 6,532,508 | 199,222 | 5,637,485
Financial assets at FVTOCI | 20,419,227 | 622,727 | 7,301,222
Financial liabilities at FVTPL | 589,117 | 17,966 |
Level 3 of fair value hierarchy [member] | Forward exchange contracts [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 0 |  |
Level 3 of fair value hierarchy [member] | Private-placement funds [member] | Non-derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 1,503,382 | 45,849 | 1,796,015
Level 3 of fair value hierarchy [member] | Unquoted preferred shares [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTOCI, Investments in equity instruments | 14,808 | 452 | 13,303
Level 3 of fair value hierarchy [member] | Unquoted preferred shares [member] | Non-derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 863,484 | 26,334 | 747,960
Level 3 of fair value hierarchy [member] | Hybrid financial assets Convertible notes [member] | Non-derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL |  |  | 61,410
Level 3 of fair value hierarchy [member] | Convertible notes [member] | Hybrid financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 360,635 | 10,998 |
Level 3 of fair value hierarchy [member] | Preferred shares with warrants [member] | Hybrid financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 65,570 | 2,000 |
Level 3 of fair value hierarchy [member] | Documentary investment agreement [member] | Hybrid financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 9,000 | 274 |
Level 3 of fair value hierarchy [member] | Unquoted ordinary shares [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTOCI, Investments in equity instruments | 12,846,151 | 391,770 | $ 607,528
Level 3 of fair value hierarchy [member] | Contingent considerations [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial liabilities at FVTPL | $ 589,117 | $ 17,966 |

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