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Operating Segments Information - Summary of Segment Information (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($) | Dec. 31, 2017 USD ($)
Disclosure of operating segments [line items] |  |  |  |  |
OPERATING REVENUES | $ 290,441,208 | $ 9,798,961 | $ 274,884,107 | $ 283,302,536 |
Interest income | 306,871 | 10,353 | 230,067 | 242,084 |
Interest expense | (1,774,886) | (59,882) | (2,217,537) | (2,268,786) |
Depreciation and amortization | (29,205,184) | (985,331) | (29,470,437) | (29,518,664) |
Share of the profit or loss of associates and joint ventures | 525,782 | 17,739 | 1,503,910 | 126,265 |
Impairment loss | (764,881) | (25,806) | (980,117) | (258,129) |
Segment profit before income tax | 31,020,663 | 1,046,581 | 27,968,705 | 25,011,788 |
Expenditures for segment assets | 23,677,682 | 798,842 | 27,680,862 | 28,280,821 |
Investments accounted for using the equity method | 48,753,751 |  | 49,824,690 | 37,122,244 | $ 1,644,863
Segment assets | 363,922,272 |  | 357,930,576 | 364,986,892 | 12,278,079
Packaging segment [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
OPERATING REVENUES | 126,225,119 | 4,258,607 | 125,282,829 | 116,607,314 |
Interest income | 43,744 | 1,476 | 32,499 | 53,235 |
Interest expense | (1,969,562) | (66,450) | (1,727,127) | (1,520,118) |
Depreciation and amortization | (19,105,457) | (644,584) | (18,706,891) | (18,946,460) |
Share of the profit or loss of associates and joint ventures | 568,291 | 19,173 | 1,513,394 | 126,265 |
Impairment loss | (218,214) | (7,362) | (974,095) | (139,397) |
Segment profit before income tax | 12,065,304 | 407,061 | 13,921,640 | 15,479,868 |
Expenditures for segment assets | 17,769,612 | 599,515 | 17,561,135 | 19,691,068 |
Investments accounted for using the equity method | 48,566,333 |  | 49,597,195 | 37,122,244 | 1,638,540
Segment assets | 195,503,889 |  | 200,604,111 | 193,323,304 | 6,595,947
Testing segment [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
OPERATING REVENUES | 26,157,277 | 882,499 | 27,031,750 | 25,191,916 |
Interest income | 48,532 | 1,637 | 41,405 | 12,536 |
Interest expense | (11,920) | (402) | (5,980) | (5,821) |
Depreciation and amortization | (6,476,743) | (218,514) | (6,566,936) | (6,516,912) |
Share of the profit or loss of associates and joint ventures | (42,509) | (1,434) | (9,484) |  |
Impairment loss | (72,798) | (2,456) | (4,136) |  |
Segment profit before income tax | 6,904,067 | 232,931 | 7,226,531 | 6,354,140 |
Expenditures for segment assets | 4,507,097 | 152,061 | 8,247,003 | 4,754,481 |
Investments accounted for using the equity method | 187,418 |  | 227,495 |  | 6,323
Segment assets | 43,383,691 |  | 42,962,643 | 42,652,569 | 1,463,687
EMS segment [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
OPERATING REVENUES | 133,948,016 | 4,519,164 | 115,395,130 | 138,242,100 |
Interest income | 269,640 | 9,097 | 130,659 | 149,385 |
Interest expense | 0 | 0 | (44,433) | (147,792) |
Depreciation and amortization | (2,133,253) | (71,972) | (2,759,298) | (2,738,722) |
Impairment loss |  |  | (1,886) | (102,389) |
Segment profit before income tax | 6,883,327 | 232,231 | 4,626,263 | 2,874,944 |
Expenditures for segment assets | 850,235 | 28,685 | 906,042 | 2,917,939 |
Segment assets | 81,588,691 |  | 73,915,639 | 79,997,341 | 2,752,655
Estate Segment [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
OPERATING REVENUES | 412,863 | 13,929 | 3,909,580 | 1,340 |
Interest income | 30,441 | 1,027 | 29,131 | 54,876 |
Interest expense | (62,714) | (2,116) |  |  |
Depreciation and amortization | (180,792) | (6,100) | (55,271) | (24,074) |
Segment profit before income tax | 5,120,301 | 172,750 | 1,546,326 | (172,521) |
Expenditures for segment assets | 169,559 | 5,721 | 114,462 | 143,436 |
Segment assets | 33,080,694 |  | 28,468,242 | 30,000,273 | 1,116,083
All other segments [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
OPERATING REVENUES | 3,697,933 | 124,762 | 3,264,818 | 3,259,866 |
Interest income | 183,824 | 6,202 | 8,166 | 13,445 |
Interest expense | 0 | 0 | (451,790) | (636,448) |
Depreciation and amortization | (1,308,939) | (44,160) | (1,382,041) | (1,292,496) |
Impairment loss | (473,869) | (15,988) |  | (16,343) |
Segment profit before income tax | 47,664 | 1,608 | 647,945 | 475,357 |
Expenditures for segment assets | 381,179 | 12,860 | 852,220 | 773,897 |
Segment assets | 10,365,307 |  | 11,979,941 | 19,013,405 | $ 349,707
Adjustments and Eliminations [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
Interest income | (269,310) | (9,086) | (11,793) | (41,393) |
Interest expense | 269,310 | 9,086 | 11,793 | 41,393 |
Inter-segment revenues [member] | Packaging segment [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
OPERATING REVENUES | 4,911,026 | 165,689 | 4,929,897 | 9,454,671 |
Inter-segment revenues [member] | Testing segment [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
OPERATING REVENUES | 184,707 | 6,232 | 243,980 | 191,608 |
Inter-segment revenues [member] | EMS segment [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
OPERATING REVENUES | 47,119,404 | 1,589,723 | 47,721,424 | 58,451,996 |
Inter-segment revenues [member] | Estate Segment [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
OPERATING REVENUES | 23,943 | 808 |  |  |
Inter-segment revenues [member] | All other segments [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
OPERATING REVENUES | 8,359,697 | 282,041 | 9,186,359 | 7,659,282 |
Inter-segment revenues [member] | Adjustments and Eliminations [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
OPERATING REVENUES | (60,598,777) | (2,044,493) | (62,081,660) | (75,757,557) |
Operating segment [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
OPERATING REVENUES | 351,039,985 | 11,843,454 | 336,965,767 | 359,060,093 |
Operating segment [member] | Packaging segment [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
OPERATING REVENUES | 131,136,145 | 4,424,296 | 130,212,726 | 126,061,985 |
Operating segment [member] | Testing segment [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
OPERATING REVENUES | 26,341,984 | 888,731 | 27,275,730 | 25,383,524 |
Operating segment [member] | EMS segment [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
OPERATING REVENUES | 181,067,420 | 6,108,887 | 163,116,554 | 196,694,096 |
Operating segment [member] | Estate Segment [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
OPERATING REVENUES | 436,806 | 14,737 | 3,909,580 | 1,340 |
Operating segment [member] | All other segments [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
OPERATING REVENUES | $ 12,057,630 | $ 406,803 | $ 12,451,177 | $ 10,919,148 |

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