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Cash Flows Information - Summary of Non-cash Investing Activities (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Payments for property, plant and equipment        
Purchase of property, plant and equipment $ 74,417,541 $ 2,682,681 $ 59,024,201 $ 63,073,887
Increase in other non-current assets 1,184,927 42,715 78,291 68,560
Decrease (increase) in other payables (4,671,228) (168,394) 3,029,162 (6,254,579)
Capitalized borrowing costs (25,581) (922) (54,208) (77,715)
Payments for property, plant and equipment 70,905,659 2,556,080 62,077,446 56,810,153
Proceeds from disposal of property, plant and equipment        
Consideration from disposal of property, plant and equipment 1,128,850 40,693 5,184,925 441,444
Increase in other non-current assets (134,760) (4,858)    
Increase (decrease) in other receivables 610,912 22,024 (735,812) 7,495
Proceeds from disposal of property, plant and equipment 1,605,002 57,859 4,449,113 448,939
Payments for other intangible assets        
Purchase of other intangible assets 1,069,866 38,568 982,655 1,350,908
Decrease in other payables       60,160
Purchase of intangible assets classified as investing activities $ 1,069,866 $ 38,568 $ 982,655 $ 1,411,068