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Equity - Summary of Exchange Differences on Translating Foreign Operations (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
Exchange differences on translating foreign operations (5,202,145) $ (173,927) 227,821 (5,287,734)
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
Exchange differences on translating foreign operations [member]        
Balance at January 1 (5,888,574) (196,876) (6,733,659) (1,643,623)
Exchange differences on translating foreign operations (4,788,135) (160,085) 426,186 (4,952,815)
Share from associates and joint venture accounted for using the equity method (85,975) (2,875) 136,608 (137,221)
Disposal of associates and joint venture accounted for using the equity method     282,291  
Balance at December 31 $ (10,762,684) $ (359,836) $ (5,888,574) $ (6,733,659)