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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, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 TWD ($)
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Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | $ 8,934,151 | $ 290,731 | $ 5,436,280
Unsecured subordinate corporate bonds | 1,059,712 | 34,485 | 1,076,458
Trade receivables, net | 5,402,714 | 175,812 | 6,092,462
Financial assets at FVTOCI | 6,944,985 | 226,000 | 8,112,274
Financial liabilities at FVTPL | 626,760 | 20,396 | 417,660
Swap contracts [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 3,205,828 | 104,323 | 85,629
Financial liabilities at FVTPL | 543,547 | 17,688 | 360,797
Forward exchange contracts [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 246,710 | 8,028 | 23,373
Financial liabilities at FVTPL | 83,213 | 2,708 | 56,863
Quoted ordinary shares [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTOCI, Investments in equity instruments | 45,683 | 1,486 | 102,124
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 | 2,521,964 | 82,069 | 2,683,193
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 | 293,385 | 9,547 | 334,223
Unquoted preferred shares [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTOCI, Investments in equity instruments | 13,883 | 452 | 11,245
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 | 628,156 | 20,441 | 583,270
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 | 1,599,932 | 52,064 | 1,322,686
Unquoted ordinary shares [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTOCI, Investments in equity instruments | 419,491 | 13,651 | 820,779
Contingent considerations [member] | Non derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 438,176 | 14,259 | 394,943
Limited partnership [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTOCI, Investments in equity instruments | 3,502 | 114 | 9,206
Target redemption forward contracts [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL |  |  | 500
Call option and put option of convertible bonds [Member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL |  |  | 8,463
Level 1 of fair value hierarchy [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 2,815,349 | 91,616 | 3,017,416
Financial assets at FVTOCI | 45,683 | 1,486 | 102,124
Level 1 of fair value hierarchy [member] | Quoted ordinary shares [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTOCI, Investments in equity instruments | 45,683 | 1,486 | 102,124
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 | 2,521,964 | 82,069 | 2,683,193
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 | 293,385 | 9,547 | 334,223
Level 2 of fair value hierarchy [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 3,452,538 | 112,351 | 117,965
Financial liabilities at FVTPL | 626,760 | 20,396 | 417,660
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 | 3,205,828 | 104,323 | 85,629
Financial liabilities at FVTPL | 543,547 | 17,688 | 360,797
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 | 246,710 | 8,028 | 23,373
Financial liabilities at FVTPL | 83,213 | 2,708 | 56,863
Level 2 of fair value hierarchy [Member] | Target redemption forward contracts [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL |  |  | 500
Level 2 of fair value hierarchy [Member] | Call option and put option of convertible bonds [Member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL |  |  | 8,463
Level 3 of fair value hierarchy [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 2,666,264 | 86,764 | 2,300,899
Unsecured subordinate corporate bonds | 1,059,712 | 34,485 | 1,076,458
Trade receivables, net | 5,402,714 | 175,812 | 6,092,462
Financial assets at FVTOCI | 6,899,302 | 224,514 | 8,010,150
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 | 13,883 | 452 | 11,245
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 | 628,156 | 20,441 | 583,270
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 | 1,599,932 | 52,064 | 1,322,686
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 | 419,491 | 13,651 | 820,779
Level 3 of fair value hierarchy [member] | Contingent considerations [member] | Non derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 438,176 | 14,259 | 394,943
Level 3 of fair value hierarchy [member] | Limited partnership [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at FVTOCI, Investments in equity instruments | $ 3,502 | $ 114 | $ 9,206

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