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Operating Segments Information - Summary of Segment Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2024
USD ($)
Disclosure of operating segments [line items]          
Operating revenue $ 595,409,585 $ 18,158,267 $ 581,914,471 $ 670,872,643  
Interest income 1,883,518 57,442 1,513,407 654,747  
Interest expense (6,747,843) (205,790) (6,238,910) (3,989,134)  
Depreciation and amortization (59,815,212) (1,824,190) (58,101,863) (55,451,889)  
Share of the profit or loss of associates and joint ventures 896,702 27,347 1,080,600 1,185,377  
Impairment loss (176,023) (5,368) (146,570) (388,775)  
Segment profit before income tax 41,733,373 1,272,747 42,611,823 81,763,628  
Expenditures for segment assets 96,207,546 2,934,052 48,758,649 75,800,574  
Investments accounted for using the equity method 20,423,340   19,678,314 14,679,346 $ 622,853
Contract assets 5,640,317   5,100,076 5,731,173 172,013
Packaging segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 261,731,413 7,982,050 256,805,887 303,947,502  
Interest income 223,222 6,808 188,704 109,148  
Interest expense (2,701,084) (82,375) (2,907,679) (2,150,382)  
Depreciation and amortization (33,951,864) (1,035,433) (34,110,372) (33,509,358)  
Share of the profit or loss of associates and joint ventures 698,852 21,313 916,310 779,474  
Impairment loss (121,992) (3,720) (81,133) (64,257)  
Segment profit before income tax 28,948,970 882,859 25,405,636 51,824,439  
Expenditures for segment assets 58,566,380 1,786,105 27,881,152 45,936,563  
Investments accounted for using the equity method 15,422,237   15,159,266 10,341,203 470,334
Contract assets 4,337,297   4,066,174 4,869,541 132,275
Testing segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 54,561,480 1,663,967 49,879,923 55,960,182  
Interest income 182,106 5,554 124,443 84,562  
Interest expense (766,292) (23,370) (720,145) (463,043)  
Depreciation and amortization (17,457,538) (532,404) (16,173,653) (14,901,939)  
Share of the profit or loss of associates and joint ventures 53,574 1,634 134,667 81,627  
Impairment loss (2,845) (87) (65,437) (105,169)  
Segment profit before income tax 10,616,147 323,762 9,369,875 14,626,156  
Expenditures for segment assets 31,397,079 957,520 13,664,416 21,765,965  
Investments accounted for using the equity method 2,618,682   2,338,125 1,643,940 79,863
Contract assets 1,303,020   1,033,902 861,632 39,738
EMS segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 271,293,309 8,273,660 268,218,002 301,966,818  
Interest income 1,409,437 42,984 1,087,121 418,507  
Interest expense (2,062,626) (62,904) (1,816,814) (1,029,128)  
Depreciation and amortization (5,895,380) (179,792) (5,335,496) (4,654,383)  
Share of the profit or loss of associates and joint ventures 152,996 4,666 38,211 324,276  
Impairment loss (51,186) (1,561) 0 (219,349)  
Segment profit before income tax 7,594,473 231,609 9,216,053 14,368,179  
Expenditures for segment assets 5,551,760 169,313 6,207,532 6,188,401  
Investments accounted for using the equity method 2,355,629   2,160,112 2,694,203 71,840
All other segments [member]          
Disclosure of operating segments [line items]          
Operating revenue 7,823,383 238,590 7,010,659 8,998,141  
Interest income 68,753 2,096 113,139 42,530  
Interest expense (1,217,841) (37,141) (794,272) (346,581)  
Depreciation and amortization (2,510,430) (76,561) (2,482,342) (2,386,209)  
Share of the profit or loss of associates and joint ventures (8,720) (266) (8,588)    
Impairment loss 0 0      
Segment profit before income tax (5,426,217) (165,483) (1,379,741) 944,854  
Expenditures for segment assets 692,327 21,114 1,005,549 1,909,645  
Investments accounted for using the equity method 26,792   20,811   $ 816
Inter-group revenues [member]          
Disclosure of operating segments [line items]          
Operating revenue 0 0      
Inter-group revenues [member] | Packaging segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 5,829,221 177,774 4,550,622 6,940,878  
Inter-group revenues [member] | Testing segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 420,691 12,830 447,279 524,387  
Inter-group revenues [member] | EMS segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 35,110,458 1,070,767 26,639,833 35,533,226  
Inter-group revenues [member] | All other segments [member]          
Disclosure of operating segments [line items]          
Operating revenue 6,536,547 199,346 6,776,002 9,080,132  
Inter-group revenues [member] | Adjustments and Eliminations [member]          
Disclosure of operating segments [line items]          
Operating revenue (47,896,917) (1,460,717) (38,413,736) (52,078,623)  
Operating segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 643,306,502 19,618,984 620,328,207 722,951,266  
Operating segment [member] | Packaging segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 267,560,634 8,159,824 261,356,509 310,888,380  
Operating segment [member] | Testing segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 54,982,171 1,676,796 50,327,202 56,484,569  
Operating segment [member] | EMS segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 306,403,767 9,344,427 294,857,835 337,500,044  
Operating segment [member] | All other segments [member]          
Disclosure of operating segments [line items]          
Operating revenue $ 14,359,930 $ 437,937 $ 13,786,661 $ 18,078,273