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Property, Plant and Equipment, Net - Summary of Property, Plant and Equipment, Net (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance $ 20,446,205   $ 20,111,121 $ 17,994,686
Additions 3,228,471   4,918,482 6,552,702
Disposals (27,612)   (48,681) (76,375)
Reclassifications 0   1,012 0
Depreciation expenses (4,498,306)   (4,523,081) (4,355,032)
Impairment losses (9,236) $ (302) (12,721) (4,843)
Exchange adjustments (19)   73 (17)
Ending Balance 19,139,503 $ 625,065 20,446,205 20,111,121
Land [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 452,738   452,738 452,738
Additions 0   0 0
Disposals 0   0 0
Reclassifications 2,000   0 0
Depreciation expenses 0   0 0
Impairment losses 0   0 0
Exchange adjustments 0   0 0
Ending Balance 454,738   452,738 452,738
Buildings [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 5,385,508   4,343,556 4,092,286
Additions 1,303   3,780 1,345
Disposals 0   0 0
Reclassifications 469,597   1,503,432 673,208
Depreciation expenses (557,187)   (465,260) (423,283)
Impairment losses 0   0 0
Exchange adjustments 0   0 0
Ending Balance 5,299,221   5,385,508 4,343,556
Machinery and equipment [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 12,758,368   13,282,185 11,348,297
Additions 5,579   6,748 11,829
Disposals (16,574)   (46,084) (66,873)
Reclassifications 1,787,140   2,603,381 4,890,400
Depreciation expenses (3,043,504)   (3,075,191) (2,896,612)
Impairment losses (9,236)   (12,721) (4,843)
Exchange adjustments 0   50 (13)
Ending Balance 11,481,773   12,758,368 13,282,185
Tools [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 796,697   837,990 952,361
Additions 291   636 407
Disposals (11,038)   (2,597) (9,502)
Reclassifications 586,090   685,481 690,346
Depreciation expenses (635,227)   (724,813) (795,622)
Impairment losses 0   0 0
Exchange adjustments 0   0 0
Ending Balance 736,813   796,697 837,990
Other [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 548,694   511,723 509,397
Additions 1,376   0 189
Disposals 0   0 0
Reclassifications 226,610   294,765 241,656
Depreciation expenses (262,388)   (257,817) (239,515)
Impairment losses 0   0 0
Exchange adjustments (19)   23 (4)
Ending Balance 514,273   548,694 511,723
Construction in progress and equipment to be inspected [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 504,200   682,929 639,607
Additions 3,219,922   4,907,318 6,538,932
Disposals 0   0 0
Reclassifications (3,071,437)   (5,086,047) (6,495,610)
Depreciation expenses 0   0 0
Impairment losses 0   0 0
Exchange adjustments 0   0 0
Ending Balance 652,685   504,200 682,929
Gross carrying amount [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 81,866,361   78,108,945 73,187,794
Ending Balance 84,341,575   81,866,361 78,108,945
Gross carrying amount [member] | Land [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 452,738   452,738 452,738
Ending Balance 454,738   452,738 452,738
Gross carrying amount [member] | Buildings [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 13,379,852   11,877,419 11,212,129
Ending Balance 13,850,418   13,379,852 11,877,419
Gross carrying amount [member] | Machinery and equipment [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 59,197,255   57,176,339 53,246,474
Ending Balance 60,650,428   59,197,255 57,176,339
Gross carrying amount [member] | Tools [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 5,716,357   5,574,316 5,451,547
Ending Balance 5,959,251   5,716,357 5,574,316
Gross carrying amount [member] | Other [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 2,615,959   2,345,204 2,185,299
Ending Balance 2,774,055   2,615,959 2,345,204
Gross carrying amount [member] | Construction in progress and equipment to be inspected [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 504,200   682,929 639,607
Ending Balance 652,685   504,200 682,929
Accumulated depreciation and impairment [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance (61,420,156)   (57,997,824) (55,193,108)
Ending Balance (65,202,072)   (61,420,156) (57,997,824)
Accumulated depreciation and impairment [member] | Land [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 0   0 0
Ending Balance 0   0 0
Accumulated depreciation and impairment [member] | Buildings [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance (7,994,344)   (7,533,863) (7,119,843)
Ending Balance (8,551,197)   (7,994,344) (7,533,863)
Accumulated depreciation and impairment [member] | Machinery and equipment [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance (46,438,887)   (43,894,154) (41,898,177)
Ending Balance (49,168,655)   (46,438,887) (43,894,154)
Accumulated depreciation and impairment [member] | Tools [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance (4,919,660)   (4,736,326) (4,499,186)
Ending Balance (5,222,438)   (4,919,660) (4,736,326)
Accumulated depreciation and impairment [member] | Other [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance (2,067,265)   (1,833,481) (1,675,902)
Ending Balance (2,259,782)   (2,067,265) (1,833,481)
Accumulated depreciation and impairment [member] | Construction in progress and equipment to be inspected [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 0   0 0
Ending Balance $ 0   $ 0 $ 0