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Income Tax - Summary of Major Components of Income Tax Expense (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Current income tax        
In respect of the current year $ 170,118 $ 5,207,309 $ 4,979,766 $ 4,177,900
Income tax on unappropriated earnings (33,406) (1,022,560) 1,076,353 829,345
Changes in estimate for prior years (3,392) (103,822) (88,162) 28,160
Current income tax 133,320 4,080,927 5,967,957 5,035,405
Deferred income tax        
In respect of the current year (7,426) (227,327) 534,472 574,541
Effect of tax rate changes 21,475 657,346   14,184
Changes in estimate for prior years 186 5,696 52,872 (206,788)
Effect of foreign currency exchange differences (107) (3,273) (31,698) (26,498)
Deferred income tax 14,128 432,442 555,646 355,439
Income tax expense recognized in profit or loss $ 147,448 $ 4,513,369 $ 6,523,603 $ 5,390,844