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Profit Before Income Tax - Summary of Finance Costs (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Analysis of income and expense [abstract]        
Interest on lease liabilities $ 105,159 $ 3,791 $ 88,026 $ 88,742
Interest on borrowings and bonds payable 2,790,368 100,590 3,498,999 4,211,541
Total interest expense for financial liabilities measured at amortized cost 2,895,527 104,381 3,587,025 4,300,283
Less: Amounts included in the cost of qualifying assets        
Inventories related to real estate business (71,011) (2,560) (95,589) (35,713)
Property, plant and equipment (25,581) (922) (54,208) (77,715)
Interest expense 2,798,935 100,899 3,437,228 4,186,855
Other finance costs 32,372 1,167 22,283 16,540
Finance costs $ 2,831,307 $ 102,066 $ 3,459,511 $ 4,203,395