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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, 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

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