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Equity - Summary of Unrealized Gain (Loss) on Available-for-sale Financial Assets (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Balance at January 1 $ 219,027,922   $ 201,310,187 $ 166,841,165
Unrealized gain arising on revaluation of available-for-sale financial assets       224,036
Share from associates and joint venture accounted for using the equity method (85,975) $ (2,874) 136,608 264,389
Balance at December 31 $ 212,802,312 $ 7,114,755 219,027,922 201,310,187
Reserve of gains and losses on remeasuring available-for-sale financial assets excluding changes in capital surplus [member]        
Balance at January 1     $ 422,570 (197,314)
Unrealized gain arising on revaluation of available-for-sale financial assets       169,585
Cumulative loss reclassified to profit or loss on impairment of available-for-sale financial assets       50,206
Cumulative gain reclassified to profit or loss on disposal of available-for-sale financial assets       (1,517)
Share from associates and joint venture accounted for using the equity method       401,610
Balance at December 31       $ 422,570