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Income Tax - Summary of Major Components of Income Tax Expense (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Current income tax        
In respect of the current year $ 4,979,766 $ 168,008 $ 4,177,900 $ 4,029,076
Income tax on unappropriated earnings 1,076,353 36,314 829,345 187,654
Changes in estimate for prior years (88,162) (2,974) 28,160 (20,719)
Current income tax 5,967,957 201,348 5,035,405 4,196,011
Deferred income tax        
In respect of the current year 534,472 18,032 574,541 190,829
Adjustments attributable to changes in tax rates     14,184 3,794
Changes in estimate for prior years 52,872 1,784 (206,788) (20,890)
Effect of foreign currency exchange differences (31,698) (1,070) (26,498) (58,671)
Deferred income tax 555,646 18,746 355,439 115,062
Income tax expense recognized in profit or loss $ 6,523,603 $ 220,094 $ 5,390,844 $ 4,311,073