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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, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Major components of tax expense (income) [abstract] |  |  |  |
Profit before income tax | $ 23,279,811 | $ 778,328 | $ 31,937,678 | $ 31,020,663
Income tax expense calculated at the statutory rates | 11,802,811 | 394,611 | 13,540,599 | 10,890,498
Nontaxable expense (income) in determining taxable income | 459,133 | 15,350 | 353,019 | 483,715
Tax-exempt income | (495,883) | (16,579) | (2,515,453) | (623,566)
Additional income tax on unappropriated earnings | 19,115 | 639 | (1,022,560) | 1,076,353
Loss carry-forward and income tax credits currently used | (898,198) | (30,030) | (971,124) | (1,124,043)
Remeasurement of deferred income tax assets, net | (5,588,335) | (186,838) | (4,776,271) | (4,131,473)
Changes in estimate for prior periods | (352,579) | (11,788) | (103,822) | (88,162)
Withholding tax | 65,182 | 2,179 | 8,981 | 40,281
Income tax expense recognized in profit or loss | $ 5,011,246 | $ 167,544 | $ 4,513,369 | $ 6,523,603

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