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Income Tax - Summary of Reconciliation of Income Tax Expense (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
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