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Income Tax - Summary of Reconciliation of Income Tax Expense (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Major components of tax expense (income) [abstract] |  |  |  |
Profit before income tax | $ 41,733,373 | $ 1,272,747 | $ 42,611,823 | $ 81,763,628
Income tax expense calculated at the statutory rates | 18,877,355 | 575,704 | 18,763,311 | 35,906,719
Nontaxable expense (income) in determining taxable income | 668,184 | 20,378 | 1,132,092 | (177,734)
Tax-exempt income | (7,727,576) | (235,669) | (7,369,986) | (14,789,999)
Additional income tax on unappropriated earnings | 250,421 | 7,637 | (3,449,958) | 844,855
Income tax credits | (2,250,870) | (68,645) | (1,921,721) | (2,514,002)
The origination and reversal of temporary differences | (251,896) | (7,682) | 69,767 | 1,304,931
Income tax adjustments on prior years | (514,176) | (15,681) | (31,609) | (209,150)
Unrecognized deferred tax liability for temporary differences associated with investments | (1,996,092) | (60,875) | (2,557,436) | (3,523,716)
Unrecognized loss carryforwards | 746,146 | 22,755 | 455,437 | 271,730
Withholding tax | 14,843 | 453 | 12,433 | 31,900
Land value increment tax | 19,604 | 598 | 0 | 0
House and land transactions income tax | 0 | 0 | 201,633 | 0
Others | 80,520 | 2,456 | 0 | 0
Income tax expense recognized in profit or loss | $ 7,916,463 | $ 241,429 | $ 5,303,963 | $ 17,145,534

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