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Operating Segments Information - Summary of Segment Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2019
USD ($)
Disclosure of operating segments [line items]          
Operating revenue $ 413,182,184 $ 13,814,182 $ 371,092,421 $ 290,441,208  
Interest income 549,681 18,378 466,211 306,871  
Interest expense (4,186,855) (139,982) (3,535,886) (1,774,886)  
Depreciation and amortization (50,466,841) (1,687,290) (42,688,903) (29,205,184)  
Share of the profit or loss of associates and joint ventures 182,275 6,094 (480,244) 525,782  
Impairment loss (601,207) (20,100) (654,081) (764,881)  
Segment profit before income tax 23,279,811 778,328 31,937,678 31,020,663  
Expenditures for segment assets 63,073,887 2,108,789 39,092,238 23,677,682  
Investments accounted for using the equity method 12,085,207   9,312,308 48,753,751 $ 404,052
Contract assets 5,897,316   4,488,500   197,169
Packaging segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 198,916,897 6,650,515 178,308,222 126,225,119  
Interest income 186,291 6,228 166,761 43,744  
Interest expense (3,403,475) (113,791) (3,647,601) (1,969,562)  
Depreciation and amortization (33,456,831) (1,118,583) (29,491,977) (19,105,457)  
Share of the profit or loss of associates and joint ventures 75,303 2,518 (456,846) 568,291  
Impairment loss (601,066) (20,096) (654,081) (218,214)  
Segment profit before income tax 7,572,763 253,185 17,866,431 12,065,304  
Expenditures for segment assets 35,462,305 1,185,634 22,787,190 17,769,612  
Investments accounted for using the equity method 8,867,316   9,152,290 48,566,333 296,467
Contract assets 4,162,124   3,488,372   139,155
Testing segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 42,658,686 1,426,235 35,903,202 26,157,277  
Interest income 90,091 3,012 55,108 48,532  
Interest expense (545,609) (18,242) (101,338) (11,920)  
Depreciation and amortization (12,379,703) (413,899) (9,560,610) (6,476,743)  
Share of the profit or loss of associates and joint ventures 39,852 1,332 (23,398) (42,509)  
Impairment loss (141) (4)   (72,798)  
Segment profit before income tax 10,321,537 345,086 7,952,484 6,904,067  
Expenditures for segment assets 23,966,051 801,272 12,991,023 4,507,097  
Investments accounted for using the equity method 1,123,490   160,018 187,418 37,562
Contract assets 1,735,192   1,000,128   58,014
EMS segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 165,789,479 5,542,945 151,890,384 133,948,016  
Interest income 249,487 8,341 354,343 269,640  
Interest expense (255,404) (8,539)      
Depreciation and amortization (2,534,825) (84,748) (2,065,590) (2,133,253)  
Share of the profit or loss of associates and joint ventures 67,120 2,244      
Segment profit before income tax 6,082,106 203,348 6,225,984 6,883,327  
Expenditures for segment assets 2,770,129 92,615 2,529,771 850,235  
Investments accounted for using the equity method 2,094,401       $ 70,023
All other segments [member]          
Disclosure of operating segments [line items]          
Operating revenue 5,817,122 194,487 4,990,613 4,110,796  
Interest income 284,458 9,511 352,232 214,265  
Interest expense (243,013) (8,124) (249,180) (62,714)  
Depreciation and amortization (2,095,482) (70,060) (1,570,726) (1,489,731)  
Impairment loss       (473,869)  
Segment profit before income tax (696,595) (23,291) (107,221) 5,167,965  
Expenditures for segment assets 875,402 29,268 784,254 550,738  
Adjustments and Eliminations [member]          
Disclosure of operating segments [line items]          
Interest income (260,646) (8,714) (462,233) (269,310)  
Interest expense 260,646 8,714 462,233 269,310  
Inter-group revenues [member] | Packaging segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 5,370,963 179,571 3,531,431 4,911,026  
Inter-group revenues [member] | Testing segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 231,399 7,736 212,310 184,707  
Inter-group revenues [member] | EMS segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 60,638,567 2,027,368 58,836,465 47,119,404  
Inter-group revenues [member] | All other segments [member]          
Disclosure of operating segments [line items]          
Operating revenue 7,431,399 248,459 7,637,053 8,383,640  
Inter-group revenues [member] | Adjustments and Eliminations [member]          
Disclosure of operating segments [line items]          
Operating revenue (73,672,328) (2,463,134) (70,217,259) (60,598,777)  
Operating segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 486,854,512 16,277,316 441,309,680 351,039,985  
Operating segment [member] | Packaging segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 204,287,860 6,830,086 181,839,653 131,136,145  
Operating segment [member] | Testing segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 42,890,085 1,433,971 36,115,512 26,341,984  
Operating segment [member] | EMS segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 226,428,046 7,570,313 210,726,849 181,067,420  
Operating segment [member] | All other segments [member]          
Disclosure of operating segments [line items]          
Operating revenue $ 13,248,521 $ 442,946 $ 12,627,666 $ 12,494,436