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Cash Flows Information - Summary of Non-cash Investing Activities (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Payments for property, plant and equipment        
Purchase of property, plant and equipment $ 59,024,201 $ 2,102,001 $ 63,073,887 $ 39,092,238
Increase in other non-current assets 78,291 2,788 68,560 402,255
Decrease (increase) in other payables 3,029,162 107,876 (6,254,579) 1,942,259
Capitalized borrowing costs (54,208) (1,930) (77,715) (50,309)
Payments for property, plant and equipment 62,077,446 2,210,735 56,810,153 41,386,443
Proceeds from disposal of property, plant and equipment        
Consideration from disposal of property, plant and equipment 5,184,925 184,648 441,444 1,133,435
Decrease (increase) in other receivables (735,812) (26,204) 7,495 (5,791)
Proceeds from disposal of property, plant and equipment 4,449,113 158,444 448,939 1,127,644
Payments for investment properties        
Purchase of investment properties     2,532 125,853
Capitalized borrowing costs       (89)
Proceeds from disposals of investment property 6,352 226 2,532 125,764
Payments for other intangible assets        
Purchase of other intangible assets 982,655 34,995 1,350,908 537,659
Decrease in other payables     60,160 40,106
Purchase of intangible assets classified as investing activities $ 982,655 $ 34,995 $ 1,411,068 $ 577,765