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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, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
Balance at January 1 |  | $ 201,310,187 | $ 166,841,165 | $ 165,924,980
Exchange differences on translating foreign operations | $ 7,443 | 227,821 | (5,287,734) | (6,445,643)
Share from associates and joint venture accounted for using the equity method | 4,463 | 136,608 | 264,389 | (871,679)
Balance at December 31 | 7,155,436 | 219,027,922 | 201,310,187 | 166,841,165
Exchange differences on translating foreign operations [member] |  |  |  |
Balance at January 1 | (219,982) | (6,733,659) | (1,643,623) | 4,492,671
Exchange differences on translating foreign operations | 13,923 | 426,186 | (4,952,815) | (5,843,856)
Share from associates and joint venture accounted for using the equity method | 4,463 | 136,608 | (137,221) | (292,438)
Disposal of associates and joint venture accounted for using the equity method | 9,222 | 282,291 |  |
Balance at December 31 | $ (192,374) | $ (5,888,574) | $ (6,733,659) | $ (1,643,623)

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