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Income Tax Expense - Major Components of Income Tax Expense (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Current income tax:        
Current income tax on profits for the period $ 408,788   $ 326,057 $ 125,376
Income tax on unappropriated retained earnings 74,540   28,165 246,684
Prior year income tax under (over) estimation (5,016)   3,729 67,885
Total current income tax 478,312   357,951 439,945
Deferred income tax:        
Relating to origination and reversal of temporary differences 35,367   101,441 110,542
Impact of change in tax rate     (2,774)  
Total deferred income tax 35,367   98,667 110,542
Income tax expense $ 513,679 $ 17,174 $ 456,618 $ 550,487