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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, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Current income tax |  |  |  |
In respect of the current year | $ 5,002,954 | $ 167,267 | $ 5,207,309 | $ 4,979,766
Income tax on unappropriated earnings | 19,115 | 639 | (1,022,560) | 1,076,353
Changes in estimate for prior years | (352,579) | (11,788) | (103,822) | (88,162)
Current income tax | 4,669,490 | 156,118 | 4,080,927 | 5,967,957
Deferred income tax |  |  |  |
In respect of the current year | 563,512 | 18,840 | (227,327) | 534,472
Effect of tax rate changes | 54,072 | 1,808 | 657,346 |
Changes in estimate for prior years | (213,758) | (7,147) | 5,696 | 52,872
Effect of foreign currency exchange differences | (62,070) | (2,075) | (3,273) | (31,698)
Deferred income tax | 341,756 | 11,426 | 432,442 | 555,646
Income tax expense recognized in profit or loss | $ 5,011,246 | $ 167,544 | $ 4,513,369 | $ 6,523,603

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