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Income Tax Expense - Major Components of Income Tax Expense (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 TWD ($) | Dec. 31, 2020 TWD ($)
Current income tax: |  |  |  |
Current income tax on profits for the period | $ 771,378 |  | $ 1,109,752 | $ 636,876
Income tax on unappropriated retained earnings | 159,744 |  | 227,467 | 105,665
Prior year income tax overestimation | (255,935) |  | (184,284) | (133,923)
Total current income tax | 675,187 |  | 1,152,935 | 608,618
Deferred income tax: |  |  |  |
Relating to origination and reversal of temporary differences | (87,012) |  | (54,617) | (14,237)
Income tax expense | $ 588,175 | $ 19,140 | $ 1,098,318 | $ 594,381

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