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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 |

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