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Other Financial Assets - Summary of Other Financial Assets (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($)
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Disclosure of financial assets [Line Items] |  |  |
Other financial assets | $ 1,325,327 | $ 44,311 | $ 7,583,761
Current | 765,834 | 25,605 | 6,539,467
Non-current | 559,493 | 18,706 | 1,044,294
Time deposits with original maturity of over three months [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Other financial assets | 25,885 | 866 | 6,320,669
Guaranty deposits [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Other financial assets | 661,667 | 22,122 | 766,190
Pledged time deposits [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Other financial assets | 620,817 | 20,756 | 496,847
Others [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Other financial assets | $ 16,958 | $ 567 | $ 55

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