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Other Financial Assets - Summary of Other Financial Assets (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Jun. 30, 2016 TWD ($)
--- | --- | --- | --- | ---
Disclosure of financial assets [Line Items] |  |  |  |
Other financial assets | $ 247,754 | $ 7,583,761 | $ 1,642,840 |
Current | 213,638 | 6,539,467 | 472,340 |
Non-current | 34,116 | 1,044,294 | 1,170,500 |
Time deposits with original maturity of over three months [member] |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |
Other financial assets | 206,490 | 6,320,669 | 405,520 |
Guaranty deposits [member] |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |
Other financial assets | 25,031 | 766,190 | 170,594 |
Pledged time deposits [member] |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |
Other financial assets | 16,231 | 496,847 | 59,456 |
Unsecured subordinate corporate bonds [member] |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |
Other financial assets |  |  | 1,000,000 | $ 1,000,000
Others [member] |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |
Other financial assets | $ 2 | $ 55 | $ 7,270 |

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