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Operating Segments Information - Summary of Segment Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2021
USD ($)
Disclosure of operating segments [line items]          
Operating revenue $ 569,997,133 $ 20,547,842 $ 476,978,710 $ 413,182,184  
Interest income 542,329 19,550 520,783 549,681  
Interest expense (2,798,935) (100,899) (3,437,228) (4,186,855)  
Depreciation and amortization (54,524,277) (1,965,547) (51,259,065) (50,466,841)  
Share of the profit or loss of associates and joint ventures 899,700 32,433 547,612 182,275  
Impairment loss (126,766) (4,571) (992,273) (601,207)  
Segment profit before income tax 80,193,769 2,890,906 35,768,798 23,279,811  
Expenditures for segment assets 74,417,541 2,682,681 59,024,201 63,073,887  
Investments accounted for using the equity method 16,996,600   12,806,673 12,085,207 $ 612,711
Contract assets 5,607,209   4,782,904 5,897,316 202,134
Packaging segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 272,543,899 9,824,942 218,666,071 198,916,897  
Interest income 61,141 2,204 133,160 186,291  
Interest expense (1,604,107) (57,827) (2,244,280) (3,403,475)  
Depreciation and amortization (34,384,500) (1,239,528) (32,333,229) (33,456,831)  
Share of the profit or loss of associates and joint ventures 737,650 26,591 362,133 75,303  
Impairment loss (86,997) (3,137) (218,600) (601,066)  
Segment profit before income tax 41,581,126 1,498,959 17,476,440 7,572,763  
Expenditures for segment assets 48,531,368 1,749,509 38,643,303 35,462,305  
Investments accounted for using the equity method 12,744,756   9,146,344 8,867,316 459,436
Contract assets 4,735,181   3,641,244 4,162,124 170,698
Testing segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 49,978,736 1,801,685 47,271,074 42,658,686  
Interest income 88,874 3,204 79,821 90,091  
Interest expense (405,648) (14,623) (564,269) (545,609)  
Depreciation and amortization (13,819,080) (498,164) (14,189,024) (12,379,703)  
Share of the profit or loss of associates and joint ventures 66,107 2,383 99,670 39,852  
Impairment loss (39,769) (1,434) (773,673) (141)  
Segment profit before income tax 11,998,938 432,550 10,277,760 10,321,537  
Expenditures for segment assets 16,773,513 604,669 14,275,397 23,966,051  
Investments accounted for using the equity method 1,896,372   1,340,307 1,123,490 68,362
Contract assets 872,028   1,141,660 1,735,192 31,436
EMS segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 239,488,267 8,633,319 204,690,669 165,789,479  
Interest income 301,072 10,853 275,766 249,487  
Interest expense (629,584) (22,696) (443,519) (255,404)  
Depreciation and amortization (4,336,266) (156,318) (2,877,546) (2,534,825)  
Share of the profit or loss of associates and joint ventures 95,943 3,459 85,809 67,120  
Segment profit before income tax 8,528,675 307,450 8,438,766 6,082,106  
Expenditures for segment assets 7,654,560 275,940 5,614,409 2,770,129  
Investments accounted for using the equity method 2,355,472   2,320,022 2,094,401 $ 84,913
All other segments [member]          
Disclosure of operating segments [line items]          
Operating revenue 7,986,231 287,896 6,350,896 5,817,122  
Interest income 91,242 3,289 32,036 284,458  
Interest expense (159,596) (5,753) (185,160) (243,013)  
Depreciation and amortization (1,984,431) (71,537) (1,859,266) (2,095,482)  
Segment profit before income tax 18,085,030 651,947 (424,168) (696,595)  
Expenditures for segment assets 1,458,100 52,563 491,092 875,402  
Adjustments and Eliminations [member]          
Disclosure of operating segments [line items]          
Interest income       (260,646)  
Interest expense       260,646  
Depreciation and amortization     (51,259,065)    
Inter-group revenues [member]          
Disclosure of operating segments [line items]          
Operating revenue 0        
Inter-group revenues [member] | Packaging segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 7,244,889 261,171 10,436,168 5,370,963  
Inter-group revenues [member] | Testing segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 339,619 12,243 435,587 231,399  
Inter-group revenues [member] | EMS segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 27,825,073 1,003,067 21,472,775 60,638,567  
Inter-group revenues [member] | All other segments [member]          
Disclosure of operating segments [line items]          
Operating revenue 7,527,260 271,350 7,234,303 7,431,399  
Inter-group revenues [member] | Adjustments and Eliminations [member]          
Disclosure of operating segments [line items]          
Operating revenue (42,936,841) (1,547,831) (39,578,833) (73,672,328)  
Operating segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 612,933,974 22,095,673 516,557,543 486,854,512  
Operating segment [member] | Packaging segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 279,788,788 10,086,113 229,102,239 204,287,860  
Operating segment [member] | Testing segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 50,318,355 1,813,928 47,706,661 42,890,085  
Operating segment [member] | EMS segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 267,313,340 9,636,386 226,163,444 226,428,046  
Operating segment [member] | All other segments [member]          
Disclosure of operating segments [line items]          
Operating revenue $ 15,513,491 $ 559,246 $ 13,585,199 $ 13,248,521