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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, 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 $ 16,819,621   $ 15,265,311  
Effects on initial application of IFRS 16 (31,904)      
Adjusted Balance On Property Plant And Equipment 16,787,717      
Additions 4,896,656   4,945,570  
Disposals (25,785)   (14,716)  
Reclassifications 26,618   0  
Depreciation expenses (3,695,815)   (3,376,579)  
Impairment losses (9,938)     $ (956)
Exchange adjustments (9)   35  
Ending Balance 17,979,444 $ 601,118 16,819,621 15,265,311
Land [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 452,738   452,738  
Adjusted Balance On Property Plant And Equipment 452,738      
Additions 0   0  
Disposals 0   0  
Reclassifications 0   0  
Depreciation expenses 0   0  
Exchange adjustments     0  
Ending Balance 452,738   452,738 452,738
Buildings [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 3,908,731   3,919,086  
Adjusted Balance On Property Plant And Equipment 3,908,731      
Additions 116,238   247,186  
Disposals 0   0  
Reclassifications 455,792   199,724  
Depreciation expenses (384,832)   (457,265)  
Exchange adjustments     0  
Ending Balance 4,095,929   3,908,731 3,919,086
Machinery and equipment [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 10,232,093   8,813,727  
Adjusted Balance On Property Plant And Equipment 10,232,093      
Additions 2,334,358   2,445,313  
Disposals (16,033)   (904)  
Reclassifications 1,111,715   1,154,663  
Depreciation expenses (2,489,070)   (2,180,718)  
Impairment losses (9,938)      
Exchange adjustments (4)   12  
Ending Balance 11,163,121   10,232,093 8,813,727
Tools [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 742,179   690,469  
Adjusted Balance On Property Plant And Equipment 742,179      
Additions 781,465   591,229  
Disposals (9,336)   (11,745)  
Reclassifications 7,880   7,604  
Depreciation expenses (625,712)   (535,378)  
Exchange adjustments     0  
Ending Balance 896,476   742,179 690,469
Other equipment [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 413,988   420,572  
Effects on initial application of IFRS 16 (31,904)      
Adjusted Balance On Property Plant And Equipment 382,084      
Additions 224,287   172,652  
Disposals (416)   (2,067)  
Reclassifications 25,042   26,026  
Depreciation expenses (196,201)   (203,218)  
Exchange adjustments (5)   23  
Ending Balance 434,791   413,988 420,572
Construction in progress and equipment to be inspected [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 1,069,892   968,719  
Adjusted Balance On Property Plant And Equipment 1,069,892      
Additions 1,440,308   1,489,190  
Disposals 0   0  
Reclassifications (1,573,811)   (1,388,017)  
Depreciation expenses 0   0  
Exchange adjustments     0  
Ending Balance 936,389   1,069,892 968,719
Gross carrying amount [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 67,064,936   63,638,420  
Ending Balance 70,401,687   67,064,936 63,638,420
Gross carrying amount [member] | Land [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 452,738   452,738  
Ending Balance 452,738   452,738 452,738
Gross carrying amount [member] | Buildings [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 10,254,531   9,809,970  
Ending Balance 10,821,972   10,254,531 9,809,970
Gross carrying amount [member] | Machinery and equipment [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 48,274,171   45,778,207  
Ending Balance 51,244,512   48,274,171 45,778,207
Gross carrying amount [member] | Tools [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 4,402,711   4,004,703  
Ending Balance 5,008,321   4,402,711 4,004,703
Gross carrying amount [member] | Other equipment [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 2,610,893   2,624,083  
Ending Balance 1,937,755   2,610,893 2,624,083
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 1,069,892   968,719  
Ending Balance 936,389   1,069,892 968,719
Accumulated depreciation and impairment [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance (50,245,315)   (48,373,109)  
Ending Balance (52,422,243)   (50,245,315) (48,373,109)
Accumulated depreciation and impairment [member] | Land [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance 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 (6,345,800)   (5,890,884)  
Ending Balance (6,726,043)   (6,345,800) (5,890,884)
Accumulated depreciation and impairment [member] | Machinery and equipment [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance (38,042,078)   (36,964,480)  
Ending Balance (40,081,391)   (38,042,078) (36,964,480)
Accumulated depreciation and impairment [member] | Tools [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance (3,660,532)   (3,314,234)  
Ending Balance (4,111,845)   (3,660,532) (3,314,234)
Accumulated depreciation and impairment [member] | Other equipment [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Beginning Balance (2,196,905)   (2,203,511)  
Ending Balance (1,502,964)   (2,196,905) (2,203,511)
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  
Ending Balance $ 0   $ 0 $ 0