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Profit Before Income Tax - Summary of Finance Costs (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 [abstract]        
Interest on lease liabilities $ 134,871 $ 4,389 $ 105,159 $ 88,026
Interest on borrowings and bonds payable 3,912,526 127,319 2,790,368 3,498,999
Total interest expense for financial liabilities measured at amortized cost 4,047,397 131,708 2,895,527 3,587,025
Less: Amounts included in the cost of qualifying assets        
Inventories related to real estate business 0 0 (71,011) (95,589)
Property, plant and equipment (58,263) (1,896) (25,581) (54,208)
Interest expense 3,989,134 129,812 2,798,935 3,437,228
Other finance costs 20,648 672 32,372 22,283
Finance costs $ 4,009,782 $ 130,484 $ 2,831,307 $ 3,459,511