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Financial Risk and Fair Value Disclosures - Reconciliation for Fair Value Measurement in Level 3 Fair Value Hierarchy (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Disclosure of fair value measurement of assets [line items]      
Beginning balance $ 546,576,832    
Ending balance 560,168,955 $ 17,083,530 $ 546,576,832
Level 3 [member] | Financial assets at fair value through profit or loss [member]      
Disclosure of fair value measurement of assets [line items]      
Beginning balance 10,251,085   10,726,873
Recognized in profit (loss) 203,424   (1,216,735)
Recognized in other comprehensive income (loss) 0   0
Acquisition 2,329,820   1,353,205
Disposal (566,983)   (117,737)
Return of capital (12,488)   (37,730)
Transfer out of Level 3 (377,121)   (461,403)
Exchange effect 301,052   4,612
Ending balance 12,128,789   10,251,085
Level 3 [member] | Financial assets at fair value through profit or loss [member] | Common stock [member]      
Disclosure of fair value measurement of assets [line items]      
Beginning balance 3,036,255   3,198,808
Recognized in profit (loss) (119,584)   (312,149)
Recognized in other comprehensive income (loss) 0   0
Acquisition 505,538   610,153
Disposal (78,234)   0
Return of capital (83)   (1,384)
Transfer out of Level 3 (377,121)   (461,403)
Exchange effect 41,412   2,230
Ending balance 3,008,183   3,036,255
Level 3 [member] | Financial assets at fair value through profit or loss [member] | Preferred stocks [member]      
Disclosure of fair value measurement of assets [line items]      
Beginning balance 2,786,634   2,865,258
Recognized in profit (loss) 187,131   (277,994)
Recognized in other comprehensive income (loss) 0   0
Acquisition 639,779   294,046
Disposal (311,066)   (89,997)
Return of capital 0   0
Transfer out of Level 3 0   0
Exchange effect 101,455   (4,679)
Ending balance 3,403,933   2,786,634
Level 3 [member] | Financial assets at fair value through profit or loss [member] | Funds [member]      
Disclosure of fair value measurement of assets [line items]      
Beginning balance 4,274,896   4,626,333
Recognized in profit (loss) 128,617   (617,764)
Recognized in other comprehensive income (loss) 0   0
Acquisition 1,133,312   294,245
Disposal (81,371)   0
Return of capital (12,405)   (36,346)
Transfer out of Level 3 0   0
Exchange effect 153,398   8,428
Ending balance 5,596,447   4,274,896
Level 3 [member] | Financial assets at fair value through profit or loss [member] | Convertible bonds [member]      
Disclosure of fair value measurement of assets [line items]      
Beginning balance 0   36,474
Recognized in profit (loss) 3,120   (8,828)
Recognized in other comprehensive income (loss) 0   0
Acquisition 51,191   0
Disposal 0   (27,740)
Return of capital 0   0
Transfer out of Level 3 0   0
Exchange effect 455   94
Ending balance 54,766   0
Level 3 [member] | Financial assets at fair value through profit or loss [member] | Others [Member]      
Disclosure of fair value measurement of assets [line items]      
Beginning balance 153,300   0
Recognized in profit (loss) 4,140   0
Recognized in other comprehensive income (loss) 0   0
Acquisition 0   154,761
Disposal (96,312)   0
Return of capital 0   0
Transfer out of Level 3 0   0
Exchange effect 4,332   (1,461)
Ending balance 65,460   153,300
Level 3 [member] | Financial assets at fair value through other comprehensive income [member]      
Disclosure of fair value measurement of assets [line items]      
Beginning balance 3,237,388   3,610,267
Recognized in profit (loss) 0   0
Recognized in other comprehensive income (loss) 134,316   (372,879)
Acquisition 64,694   0
Disposal 0   0
Return of capital 0   0
Transfer out of Level 3 0   0
Exchange effect 0   0
Ending balance 3,436,398   3,237,388
Level 3 [member] | Financial assets at fair value through other comprehensive income [member] | Common stock [member]      
Disclosure of fair value measurement of assets [line items]      
Beginning balance 3,062,325   3,427,720
Recognized in profit (loss) 0   0
Recognized in other comprehensive income (loss) 104,499   (365,395)
Acquisition 64,694   0
Disposal 0   0
Return of capital 0   0
Transfer out of Level 3 0   0
Exchange effect 0   0
Ending balance 3,231,518   3,062,325
Level 3 [member] | Financial assets at fair value through other comprehensive income [member] | Preferred stocks [member]      
Disclosure of fair value measurement of assets [line items]      
Beginning balance 175,063   182,547
Recognized in profit (loss) 0   0
Recognized in other comprehensive income (loss) 29,817   (7,484)
Acquisition 0   0
Disposal 0   0
Return of capital 0   0
Transfer out of Level 3 0   0
Exchange effect 0   0
Ending balance $ 204,880   $ 175,063