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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance $ 214,592,588      
Depreciation expense 45,240,667 $ 1,512,560 $ 39,893,786 $ 28,625,287
Additions 63,073,887 2,108,789 39,092,238 23,677,682
Ending balance 232,093,327 7,759,723 214,592,588  
Cost [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 535,004,044 17,887,129 370,320,242 364,012,147
Additions 63,073,887 2,108,789 39,092,238 23,677,682
Disposals (22,630,764) (756,629) (29,456,450) (9,896,428)
Reclassification 745,331 24,919 (14,891) (474,352)
Acquisition through business combinations 7,034,875 235,202 156,721,779  
Effect of foreign currency exchange differences (6,782,466) (226,762) (1,200,829) (6,998,807)
Ending balance 576,444,907 19,272,648 535,004,044 370,320,242
Cost [member] | Previously stated [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 535,462,089      
Ending balance 535,462,089 17,902,443 535,462,089  
Cost [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance (458,045) (15,314)    
Ending balance     (458,045)  
Accumulated depreciation, amortisation and impairment [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 320,688,535 10,721,783 235,151,836 220,131,906
Depreciation expense 45,240,667 1,512,560 39,893,786 28,625,287
Impairment losses recognized 201,006 6,720 133,071 289,558
Disposals (22,024,853) (736,371) (28,266,113) (8,757,164)
Reclassification 294,232 9,838 (265) (199,745)
Acquisition through business combinations 4,465,048 149,283 74,736,157  
Effect of foreign currency exchange differences (4,513,055) (150,888) (778,971) (4,938,006)
Ending balance 344,351,580 11,512,925 320,688,535 235,151,836
Accumulated depreciation, amortisation and impairment [member] | Previously stated [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 320,869,501      
Ending balance 320,869,501 10,723,833 320,869,501  
Accumulated depreciation, amortisation and impairment [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance (180,966) (6,050)    
Ending balance     (180,966)  
Land [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 10,165,969      
Ending balance 10,333,822 345,497 10,165,969  
Land [member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 10,165,969 339,885 3,258,518 3,365,013
Reclassification       (35,965)
Acquisition through business combinations 189,111 6,323 6,880,400  
Effect of foreign currency exchange differences (21,258) (711) 27,051 (70,530)
Ending balance 10,333,822 345,497 10,165,969 3,258,518
Land [member] | Cost [member] | Previously stated [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 10,165,969      
Ending balance 10,165,969 339,885 10,165,969  
Buildings and improvements [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 78,963,937      
Ending balance 85,409,580 2,855,553 78,963,937  
Buildings and improvements [member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 141,708,011 4,737,814 100,187,928 96,258,175
Additions 806,844 26,976 144,898 350,434
Disposals (983,690) (32,888) (677,206) (609,294)
Reclassification 13,601,469 454,746 5,388,709 6,483,392
Acquisition through business combinations 1,044,383 34,917 37,127,957  
Effect of foreign currency exchange differences (2,204,057) (73,689) (464,275) (2,294,779)
Ending balance 153,972,960 5,147,876 141,708,011 100,187,928
Buildings and improvements [member] | Cost [member] | Previously stated [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 141,708,011      
Ending balance 141,708,011 4,737,814 141,708,011  
Buildings and improvements [member] | Accumulated depreciation, amortisation and impairment [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 62,744,074 2,097,762 41,915,064 38,229,544
Depreciation expense 6,989,392 233,681 6,325,948 5,156,558
Impairment losses recognized 78,562 2,626 29,531 2,310
Disposals (881,149) (29,460) (491,033) (478,903)
Reclassification 210,558 7,040 (265) (210,080)
Acquisition through business combinations 445,682 14,901 15,097,920  
Effect of foreign currency exchange differences (1,023,739) (34,227) (133,091) (784,365)
Ending balance 68,563,380 2,292,323 62,744,074 41,915,064
Buildings and improvements [member] | Accumulated depreciation, amortisation and impairment [member] | Previously stated [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 62,744,074      
Ending balance 62,744,074 2,097,762 62,744,074  
Machinery and equipment1 [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 108,087,970      
Ending balance 112,996,670 3,777,889 108,087,970  
Machinery and equipment1 [member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 353,838,390 11,830,103 253,198,003 248,200,756
Additions 413,008 13,808 192,673 102,301
Disposals (19,139,634) (639,908) (26,493,282) (8,449,949)
Reclassification 41,302,651 1,380,898 32,060,513 18,331,738
Acquisition through business combinations 5,507,315 184,130 95,810,062  
Effect of foreign currency exchange differences (5,176,282) (173,062) (929,579) (4,986,843)
Ending balance 376,745,448 12,595,969 353,838,390 253,198,003
Machinery and equipment1 [member] | Cost [member] | Previously stated [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 353,838,390      
Ending balance 353,838,390 11,830,103 353,838,390  
Machinery and equipment1 [member] | Accumulated depreciation, amortisation and impairment [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 245,750,420 8,216,330 187,012,805 175,499,994
Depreciation expense 35,747,308 1,195,162 31,751,251 22,722,307
Impairment losses recognized 102,056 3,412 97,680 286,880
Disposals (18,640,266) (623,212) (25,704,778) (7,540,654)
Reclassification 83,777 2,801   34,452
Acquisition through business combinations 4,000,338 133,746 53,210,063  
Effect of foreign currency exchange differences (3,294,855) (110,159) (616,601) (3,990,174)
Ending balance 263,748,778 8,818,080 245,750,420 187,012,805
Machinery and equipment1 [member] | Accumulated depreciation, amortisation and impairment [member] | Previously stated [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 245,750,420      
Ending balance 245,750,420 8,216,330 245,750,420  
Other equipment [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 6,463,160      
Ending balance 6,715,694 224,530 6,463,160  
Other equipment [member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 18,380,122 614,514 7,812,080 8,474,661
Additions 76,671 2,564 84,860 130,659
Disposals (2,507,440) (83,833) (2,251,060) (763,937)
Reclassification 3,062,838 102,402 2,148,211 174,947
Acquisition through business combinations 43,611 1,458 11,122,171  
Effect of foreign currency exchange differences (300,686) (10,053) (78,095) (204,250)
Ending balance 18,755,116 627,052 18,380,122 7,812,080
Other equipment [member] | Cost [member] | Previously stated [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 18,838,167      
Ending balance 18,838,167 629,828 18,838,167  
Other equipment [member] | Cost [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance (458,045) (15,314)    
Ending balance     (458,045)  
Other equipment [member] | Accumulated depreciation, amortisation and impairment [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 12,194,041 407,691 6,223,967 6,385,080
Depreciation expense 2,503,967 83,717 1,816,587 746,422
Impairment losses recognized 20,388 682 5,860 368
Disposals (2,503,438) (83,699) (2,070,302) (720,319)
Reclassification (103) (3)   (24,117)
Acquisition through business combinations 19,028 636 6,428,174  
Effect of foreign currency exchange differences (194,461) (6,502) (29,279) (163,467)
Ending balance 12,039,422 402,522 12,194,041 6,223,967
Other equipment [member] | Accumulated depreciation, amortisation and impairment [member] | Previously stated [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 12,375,007      
Ending balance 12,375,007 413,741 12,375,007  
Other equipment [member] | Accumulated depreciation, amortisation and impairment [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance (180,966) (6,050)    
Ending balance     (180,966)  
Construction in progress and machinery in transit [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 10,911,552      
Ending balance 16,637,561 556,254 10,911,552  
Construction in progress and machinery in transit [member] | Cost [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 10,911,552 364,813 5,863,713 7,713,542
Additions 61,777,364 2,065,441 38,669,807 23,094,288
Disposals     (34,902) (73,248)
Reclassification (57,221,627) (1,913,127) (39,612,324) (25,428,464)
Acquisition through business combinations 250,455 8,374 5,781,189  
Effect of foreign currency exchange differences 919,817 30,753 244,069 557,595
Ending balance 16,637,561 556,254 10,911,552 5,863,713
Construction in progress and machinery in transit [member] | Cost [member] | Previously stated [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance 10,911,552      
Ending balance $ 10,911,552 $ 364,813 $ 10,911,552  
Construction in progress and machinery in transit [member] | Accumulated depreciation, amortisation and impairment [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning balance       17,288
Disposals       $ (17,288)