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Profit Before Income Tax - Summary of Depreciation and Amortization (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Analysis of income and expense [Line Items]        
Property, plant and equipment $ 48,945,756 $ 1,592,768 $ 48,604,160 $ 46,016,548
Right-of-use assets 1,468,040 47,772 1,114,950 946,880
Investment properties 1,107,014 36,024 751,047 562,260
Intangible assets amortization 3,931,079 127,923 4,054,120 3,733,377
Depreciation and amortization 55,451,889 1,804,487 54,524,277 51,259,065
Depreciation expense 51,520,810 1,676,564 50,470,157 47,525,688
Operating costs [member]        
Analysis of income and expense [Line Items]        
Intangible assets amortization 2,465,837 80,242 2,443,870 2,231,060
Depreciation expense 47,894,701 1,558,565 46,880,267 44,017,839
Operating expenses [member]        
Analysis of income and expense [Line Items]        
Intangible assets amortization 1,465,242 47,681 1,610,250 1,502,317
Depreciation expense $ 3,626,109 $ 117,999 $ 3,589,890 $ 3,507,849