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Cash Flows Information - Change in Liabilities Arising From Financing Activities (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure of non-cash investing activities [line items]        
Beginning balance $ 7,538,500 $ 209,117,966 $ 223,982,006 $ 208,132,097
Net financing cash flows 772,739 21,435,763 (9,129,670) 15,104,066
Interest under operating activities 29 800 111 1,766
Rent expense under operating activities (7) (184) (7,729)  
Convertible bonds classified separately as equity components and embedded derivative liability (14,418) (399,955)    
Non-cash changes        
Lease liabilities 73,456 2,037,665 584,642 536,216
Amortization of issuance cost 12,663 351,262 171,232 200,673
Convertible bonds issued by subsidiaries and converted to ordinary shares (4) (102)    
Lease modifications (2,120) (58,799) (289,687) (239,321)
Adjustments for government subsidy     41,650  
Acquisition of subsidiaries (Note 29) 6,516 180,745 990,023 2,508,101
Disposal of subsidiaries (Note 30) (89,245) (2,475,660) (4,694,352)  
Reclassification 13,709 380,292    
Effects of foreign currency exchange (122,338) (3,393,653) (2,530,260) (2,261,592)
Ending balance 8,189,480 227,176,140 209,117,966 223,982,006
Short-term borrowings [member]        
Disclosure of non-cash investing activities [line items]        
Beginning balance 1,247,219 34,597,858 40,572,329 47,163,103
Net financing cash flows 362,055 10,043,398 (1,502,323) (4,683,142)
Non-cash changes        
Short-term borrowings transferred to long-term borrowings     (3,850,000) (1,499,000)
Acquisition of subsidiaries (Note 29)     356,417 656,820
Disposal of subsidiaries (Note 30) (88,068) (2,443,005)    
Effects of foreign currency exchange (41,883) (1,161,822) (978,565) (1,065,452)
Ending balance 1,479,323 41,036,429 34,597,858 40,572,329
Bonds payable [member]        
Disclosure of non-cash investing activities [line items]        
Beginning balance 2,027,886 56,253,554 36,522,155 16,985,936
Net financing cash flows (134,068) (3,719,057) 19,717,149 19,279,033
Convertible bonds classified separately as equity components and embedded derivative liability (14,418) (399,955)    
Non-cash changes        
Amortization of issuance cost 4,553 126,283 14,250 11,522
Convertible bonds issued by subsidiaries and converted to ordinary shares (4) (102)    
Acquisition of subsidiaries (Note 29)       245,664
Effects of foreign currency exchange 238 6,614    
Ending balance 1,884,187 52,267,337 56,253,554 36,522,155
Long-term borrowings [member]        
Disclosure of non-cash investing activities [line items]        
Beginning balance 4,051,577 112,390,724 141,078,598 137,898,329
Net financing cash flows 577,463 16,018,825 (26,500,139) 1,144,731
Non-cash changes        
Amortization of issuance cost 8,110 224,979 156,982 189,151
Short-term borrowings transferred to long-term borrowings     3,850,000 1,499,000
Adjustments for government subsidy     41,650  
Acquisition of subsidiaries (Note 29)       1,523,968
Disposal of subsidiaries (Note 30)     (4,693,682)  
Effects of foreign currency exchange (77,939) (2,162,038) (1,542,685) (1,176,581)
Ending balance 4,559,211 126,472,490 112,390,724 141,078,598
Lease liabilities [member]        
Disclosure of non-cash investing activities [line items]        
Beginning balance 211,818 5,875,830 5,808,924 6,084,729
Net financing cash flows (32,711) (907,403) (844,357) (636,556)
Interest under operating activities 29 800 111 1,766
Rent expense under operating activities (7) (184) (7,729)  
Non-cash changes        
Lease liabilities 73,456 2,037,665 584,642 536,216
Lease modifications (2,120) (58,799) (289,687) (239,321)
Acquisition of subsidiaries (Note 29) 6,516 180,745 633,606 81,649
Disposal of subsidiaries (Note 30) (1,177) (32,655) (670)  
Reclassification 13,709 380,292    
Effects of foreign currency exchange (2,754) (76,407) (9,010) (19,559)
Ending balance $ 266,759 $ 7,399,884 $ 5,875,830 $ 5,808,924