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

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