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Operating Segments Information - Summary of Segment Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2020
USD ($)
Disclosure of operating segments [line items]            
Operating revenue $ 476,978,710 $ 16,986,421 $ 413,182,184   $ 371,092,421  
Interest income 520,783 18,546 549,681   466,211  
Interest expense (3,437,228) (122,409) (4,186,855)   (3,535,886)  
Depreciation and amortization (51,259,065) (1,825,465) (50,466,841)   (42,688,903)  
Share of the profit or loss of associates and joint ventures 547,612 19,502 182,275   (480,244)  
Impairment loss (992,273) (35,337) (601,207) $ (141) (654,081)  
Segment profit before income tax 35,768,798 1,273,817 23,279,811   31,937,678  
Expenditures for segment assets 59,024,201 2,102,001 63,073,887   39,092,238  
Investments accounted for using the equity method 12,806,673   12,085,207   9,312,308 $ 456,078
Contract assets 4,782,904   5,897,316   4,488,500 170,331
Packaging segment [member]            
Disclosure of operating segments [line items]            
Operating revenue 218,666,071 7,787,253 198,916,897   178,308,222  
Interest income 133,160 4,742 186,291   166,761  
Interest expense (2,244,280) (79,925) (3,403,475)   (3,647,601)  
Depreciation and amortization (32,333,229) (1,151,468) (33,456,831)   (29,491,977)  
Share of the profit or loss of associates and joint ventures 362,133 12,896 75,303   (456,846)  
Impairment loss (218,600) (7,785) (601,066)   (654,081)  
Segment profit before income tax 17,476,440 622,380 7,572,763   17,866,431  
Expenditures for segment assets 38,643,303 1,376,186 35,462,305   22,787,190  
Investments accounted for using the equity method 9,146,344   8,867,316   9,152,290 325,724
Contract assets 3,641,244   4,162,124   3,488,372 129,674
Testing segment [member]            
Disclosure of operating segments [line items]            
Operating revenue 47,271,074 1,683,443 42,658,686   35,903,202  
Interest income 79,821 2,842 90,091   55,108  
Interest expense (564,269) (20,095) (545,609)   (101,338)  
Depreciation and amortization (14,189,024) (505,307) (12,379,703)   (9,560,610)  
Share of the profit or loss of associates and joint ventures 99,670 3,550 39,852   (23,398)  
Impairment loss (773,673) (27,552)        
Segment profit before income tax 10,277,760 366,017 10,321,537   7,952,484  
Expenditures for segment assets 14,275,397 508,383 23,966,051   12,991,023  
Investments accounted for using the equity method 1,340,307   1,123,490   160,018 47,732
Contract assets 1,141,660   1,735,192   1,000,128 40,657
EMS segment [member]            
Disclosure of operating segments [line items]            
Operating revenue 204,690,669 7,289,554 165,789,479   151,890,384  
Interest income 275,766 9,821 249,487   354,343  
Interest expense (443,519) (15,795) (255,404)      
Depreciation and amortization (2,877,546) (102,477) (2,534,825)   (2,065,590)  
Share of the profit or loss of associates and joint ventures 85,809 3,056 67,120      
Segment profit before income tax 8,438,766 300,526 6,082,106   6,225,984  
Expenditures for segment assets 5,614,409 199,943 2,770,129   2,529,771  
Investments accounted for using the equity method 2,320,022   2,094,401     $ 82,622
All other segments [member]            
Disclosure of operating segments [line items]            
Operating revenue 6,350,896 226,171 5,817,122   4,990,613  
Interest income 32,036 1,141 284,458   352,232  
Interest expense (185,160) (6,594) (243,013)   (249,180)  
Depreciation and amortization (1,859,266) (66,213) (2,095,482)   (1,570,726)  
Impairment loss         0  
Segment profit before income tax (424,168) (15,106) (696,595)   (107,221)  
Expenditures for segment assets 491,092 17,489 875,402   784,254  
Adjustments and Eliminations [member]            
Disclosure of operating segments [line items]            
Interest income     (260,646)   (462,233)  
Interest expense     260,646   462,233  
Inter-group revenues [member] | Packaging segment [member]            
Disclosure of operating segments [line items]            
Operating revenue 10,436,168 371,659 5,370,963   3,531,431  
Inter-group revenues [member] | Testing segment [member]            
Disclosure of operating segments [line items]            
Operating revenue 435,587 15,512 231,399   212,310  
Inter-group revenues [member] | EMS segment [member]            
Disclosure of operating segments [line items]            
Operating revenue 21,472,775 764,700 60,638,567   58,836,465  
Inter-group revenues [member] | All other segments [member]            
Disclosure of operating segments [line items]            
Operating revenue 7,234,303 257,632 7,431,399   7,637,053  
Inter-group revenues [member] | Adjustments and Eliminations [member]            
Disclosure of operating segments [line items]            
Operating revenue (39,578,833) (1,409,503) (73,672,328)   (70,217,259)  
Operating segment [member]            
Disclosure of operating segments [line items]            
Operating revenue 516,557,543 18,395,924 486,854,512   441,309,680  
Operating segment [member] | Packaging segment [member]            
Disclosure of operating segments [line items]            
Operating revenue 229,102,239 8,158,912 204,287,860   181,839,653  
Operating segment [member] | Testing segment [member]            
Disclosure of operating segments [line items]            
Operating revenue 47,706,661 1,698,955 42,890,085   36,115,512  
Operating segment [member] | EMS segment [member]            
Disclosure of operating segments [line items]            
Operating revenue 226,163,444 8,054,254 226,428,046   210,726,849  
Operating segment [member] | All other segments [member]            
Disclosure of operating segments [line items]            
Operating revenue $ 13,585,199 $ 483,803 $ 13,248,521   $ 12,627,666