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Income Tax - Summary of Reconciliation of Income Tax Expense (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Major components of tax expense (income) [abstract]        
Profit before income tax $ 31,020,663 $ 1,046,581 $ 27,968,705 $ 25,011,788
Income tax expense calculated at the statutory rates 10,890,498 367,426 8,634,187 6,307,148
Nontaxable expense in determining taxable income 483,715 16,319 (34,954) 160,530
Tax-exempt income (623,566) (21,038) (700,274) (537,987)
Additional income tax on unappropriated earnings 1,076,353 36,314 829,345 338,142
Loss carry-forward and income tax credits currently used (1,124,043) (37,923) (898,700) (1,286,705)
Remeasurement of deferred income tax assets, net (4,131,473) (139,389) (2,797,673) (688,584)
Changes in estimate for prior years (88,162) (2,974) 28,160 (20,719)
Withholding tax 40,281 1,359 81,543 39,248
Land value increment tax     249,210  
Income tax expense recognized in profit or loss $ 6,523,603 $ 220,094 $ 5,390,844 $ 4,311,073