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Operating Segments Information - Summary of Segment Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2022
USD ($)
Disclosure of operating segments [line items]          
Operating revenue $ 670,872,643 $ 21,831,196 $ 569,997,133 $ 476,978,710  
Interest income 654,747 21,306 542,329 520,783  
Interest expense (3,989,134) (129,812) (2,798,935) (3,437,228)  
Depreciation and amortization (55,451,889) (1,804,487) (54,524,277) (51,259,065)  
Share of the profit or loss of associates and joint ventures 1,185,377 38,574 899,700 547,612  
Impairment loss (388,775) (12,652) (126,766) (992,273)  
Segment profit before income tax 81,763,628 2,660,711 80,193,769 35,768,798  
Expenditures for segment assets 75,800,574 2,466,664 74,417,541 59,024,201  
Investments accounted for using the equity method 14,679,346   16,996,600 12,806,673 $ 477,688
Contract assets 5,731,173   5,607,209 4,782,904 186,501
Packaging segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 303,947,502 9,890,905 272,543,899 218,666,071  
Interest income 109,148 3,551 61,141 133,160  
Interest expense (2,150,382) (69,977) (1,604,107) (2,244,280)  
Depreciation and amortization (33,509,358) (1,090,444) (34,384,500) (32,333,229)  
Share of the profit or loss of associates and joint ventures 779,474 25,365 737,650 362,133  
Impairment loss (64,257) (2,092) (86,997) (218,600)  
Segment profit before income tax 51,824,438 1,686,445 41,581,126 17,476,440  
Expenditures for segment assets 45,936,563 1,494,844 48,531,368 38,643,303  
Investments accounted for using the equity method 10,341,203   12,744,756 9,146,344 336,518
Contract assets 4,869,541   4,735,181 3,641,244 158,462
Testing segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 55,960,182 1,821,028 49,978,736 47,271,074  
Interest income 84,562 2,752 88,874 79,821  
Interest expense (463,043) (15,068) (405,648) (564,269)  
Depreciation and amortization (14,901,939) (484,931) (13,819,080) (14,189,024)  
Share of the profit or loss of associates and joint ventures 81,627 2,656 66,107 99,670  
Impairment loss (105,169) (3,422) (39,769) (773,673)  
Segment profit before income tax 14,626,156 475,957 11,998,938 10,277,760  
Expenditures for segment assets 21,765,965 708,297 16,773,513 14,275,397  
Investments accounted for using the equity method 1,643,940   1,896,372 1,340,307 53,496
Contract assets 861,632   872,028 1,141,660 28,039
EMS segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 301,966,818 9,826,450 239,488,267 204,690,669  
Interest income 418,507 13,619 301,072 275,766  
Interest expense (1,029,128) (33,489) (629,584) (443,519)  
Depreciation and amortization (4,654,383) (151,461) (4,336,266) (2,877,546)  
Share of the profit or loss of associates and joint ventures 324,276 10,553 95,943 85,809  
Impairment loss (219,349) (7,138)      
Segment profit before income tax 14,368,179 467,562 8,528,675 8,438,766  
Expenditures for segment assets 6,188,401 201,380 7,654,560 5,614,409  
Investments accounted for using the equity method 2,694,203   2,355,472 2,320,022 $ 87,674
All other segments [member]          
Disclosure of operating segments [line items]          
Operating revenue 8,998,141 292,813 7,986,231 6,350,896  
Interest income 42,530 1,384 91,242 32,036  
Interest expense (346,581) (11,278) (159,596) (185,160)  
Depreciation and amortization (2,386,209) (77,651) (1,984,431) (1,859,266)  
Segment profit before income tax 944,855 30,747 18,085,030 (424,168)  
Expenditures for segment assets 1,909,645 62,143 1,458,100 491,092  
Inter-group revenues [member] | Packaging segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 6,940,878 225,867 7,244,889 10,436,168  
Inter-group revenues [member] | Testing segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 524,387 17,064 339,619 435,587  
Inter-group revenues [member] | EMS segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 35,533,226 1,156,304 27,825,073 21,472,775  
Inter-group revenues [member] | All other segments [member]          
Disclosure of operating segments [line items]          
Operating revenue 9,080,132 295,481 7,527,260 7,234,303  
Inter-group revenues [member] | Adjustments and Eliminations [member]          
Disclosure of operating segments [line items]          
Operating revenue (52,078,623) (1,694,716) (42,936,841) (39,578,833)  
Operating segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 722,951,266 23,525,911 612,933,974 516,557,543  
Operating segment [member] | Packaging segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 310,888,380 10,116,771 279,788,788 229,102,239  
Operating segment [member] | Testing segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 56,484,569 1,838,092 50,318,355 47,706,661  
Operating segment [member] | EMS segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 337,500,044 10,982,754 267,313,340 226,163,444  
Operating segment [member] | All other segments [member]          
Disclosure of operating segments [line items]          
Operating revenue $ 18,078,273 $ 588,294 $ 15,513,491 $ 13,585,199