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Equity - Summary of Exchange Differences on Translating Foreign Operations (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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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)

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