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Equity - Summary of Exchange Differences on Translating Foreign Operations (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Balance at January 1 $ 212,802,312   $ 219,027,922  
Exchange differences on translating foreign operations (831,784) $ (29,622) (5,202,145) $ 227,821
Share from associates and joint venture accounted for using the equity method 131,009 4,666 (85,975) 136,608
Balance at December 31 231,731,160 8,252,534 212,802,312 219,027,922
Exchange differences on translating foreign operations [member]        
Balance at January 1 (10,762,684) (383,286) (5,888,574) (6,733,659)
Exchange differences on translating foreign operations (1,173,204) (41,781) (4,788,135) 426,186
Share from associates and joint venture accounted for using the equity method 101,038 3,598 (85,975) 136,608
Disposal of associates and joint venture accounted for using the equity method 29,971 1,067   282,291
Disposal of foreign operations 162,940 5,803    
Balance at December 31 $ (11,641,939) $ (414,599) $ (10,762,684) $ (5,888,574)