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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