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Operating Segments Information - Summary of Segment Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure of operating segments [line items]          
Operating revenue $ 12,123,242 $ 371,092,421 $ 290,441,208 $ 274,884,107  
Interest income 15,231 466,211 306,871 230,067  
Interest expense (115,514) (3,535,886) (1,774,886) (2,217,537)  
Depreciation and amortization (1,394,607) (42,688,903) (29,205,184) (29,470,437)  
Share of the profit or loss of associates and joint ventures (15,689) (480,244) 525,782 1,503,910  
Impairment loss (21,368) (654,081) (764,881) (980,117)  
Segment profit before income tax 1,043,374 31,937,678 31,020,663 27,968,705  
Expenditures for segment assets 1,277,106 39,092,238 23,677,682 27,680,862  
Investments accounted for using the equity method 304,224   48,753,751 49,824,690 $ 9,312,308
Contract assets 146,635       4,488,500
Packaging segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 5,825,163 178,308,222 126,225,119 125,282,829  
Interest income 5,448 166,761 43,744 32,499  
Interest expense (119,164) (3,647,601) (1,969,562) (1,727,127)  
Depreciation and amortization (963,475) (29,491,977) (19,105,457) (18,706,891)  
Share of the profit or loss of associates and joint ventures (14,925) (456,846) 568,291 1,513,394  
Impairment loss (21,368) (654,081) (218,214) (974,095)  
Segment profit before income tax 583,680 17,866,431 12,065,304 13,921,640  
Expenditures for segment assets 744,436 22,787,190 17,769,612 17,561,135  
Investments accounted for using the equity method 298,996   48,566,333 49,597,195 9,152,290
Contract assets 113,962       3,488,372
Testing segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 1,172,924 35,903,202 26,157,277 27,031,750  
Interest income 1,801 55,108 48,532 41,405  
Interest expense (3,311) (101,338) (11,920) (5,980)  
Depreciation and amortization (312,336) (9,560,610) (6,476,743) (6,566,936)  
Share of the profit or loss of associates and joint ventures (764) (23,398) (42,509) (9,484)  
Impairment loss     (72,798) (4,136)  
Segment profit before income tax 259,800 7,952,484 6,904,067 7,226,531  
Expenditures for segment assets 424,404 12,991,023 4,507,097 8,247,003  
Investments accounted for using the equity method 5,228   187,418 227,495 160,018
Contract assets 32,673       $ 1,000,128
EMS segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 4,962,116 151,890,384 133,948,016 115,395,130  
Interest income 11,576 354,343 269,640 130,659  
Interest expense       (44,433)  
Depreciation and amortization (67,481) (2,065,590) (2,133,253) (2,759,298)  
Impairment loss       (1,886)  
Segment profit before income tax 203,397 6,225,984 6,883,327 4,626,263  
Expenditures for segment assets 82,645 2,529,771 850,235 906,042  
All other segments [member]          
Disclosure of operating segments [line items]          
Operating revenue 163,039 4,990,613 4,110,796 7,174,398  
Interest income 11,507 352,232 214,265 37,297  
Interest expense (8,140) (249,180) (62,714) (451,790)  
Depreciation and amortization (51,315) (1,570,726) (1,489,731) (1,437,312)  
Impairment loss     (473,869)    
Segment profit before income tax (3,503) (107,221) 5,167,965 2,194,271  
Expenditures for segment assets 25,621 784,254 550,738 966,682  
Adjustments and Eliminations [member]          
Disclosure of operating segments [line items]          
Interest income (15,101) (462,233) (269,310) (11,793)  
Interest expense 15,101 462,233 269,310 11,793  
Inter-segment revenues [member] | Packaging segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 115,369 3,531,431 4,911,026 4,929,897  
Inter-segment revenues [member] | Testing segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 6,936 212,310 184,707 243,980  
Inter-segment revenues [member] | EMS segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 1,922,132 58,836,465 47,119,404 47,721,424  
Inter-segment revenues [member] | All other segments [member]          
Disclosure of operating segments [line items]          
Operating revenue 249,495 7,637,053 8,383,640 9,186,359  
Inter-segment revenues [member] | Adjustments and Eliminations [member]          
Disclosure of operating segments [line items]          
Operating revenue (2,293,932) (70,217,259) (60,598,777) (62,081,660)  
Operating segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 14,417,174 441,309,680 351,039,985 336,965,767  
Operating segment [member] | Packaging segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 5,940,532 181,839,653 131,136,145 130,212,726  
Operating segment [member] | Testing segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 1,179,860 36,115,512 26,341,984 27,275,730  
Operating segment [member] | EMS segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 6,884,248 210,726,849 181,067,420 163,116,554  
Operating segment [member] | All other segments [member]          
Disclosure of operating segments [line items]          
Operating revenue $ 412,534 $ 12,627,666 $ 12,494,436 $ 16,360,757