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Income Tax - Summary of Reconciliation 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 ($) | Dec. 31, 2016 TWD ($)
Major components of tax expense (income) [abstract] |  |  |  |
Profit before income tax | $ 1,043,374 | $ 31,937,678 | $ 31,020,663 | $ 27,968,705
Income tax expense calculated at the statutory rates | 442,359 | 13,540,599 | 10,890,498 | 8,634,187
Nontaxable expense (income) in determining taxable income | 11,533 | 353,019 | 483,715 | (34,954)
Tax-exempt income | (82,177) | (2,515,453) | (623,566) | (700,274)
Additional income tax on unappropriated earnings | (33,406) | (1,022,560) | 1,076,353 | 829,345
Loss carry-forward and income tax credits currently used | (31,726) | (971,124) | (1,124,043) | (898,700)
Remeasurement of deferred income tax assets, net | (156,036) | (4,776,271) | (4,131,473) | (2,797,673)
Changes in estimate for prior periods | (3,392) | (103,822) | (88,162) | 28,160
Withholding tax | 293 | 8,981 | 40,281 | 81,543
Land value increment tax |  |  |  | 249,210
Income tax expense recognized in profit or loss | $ 147,448 | $ 4,513,369 | $ 6,523,603 | $ 5,390,844

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