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Other Financial Assets - Summary of Other Financial Assets (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($)
--- | --- | --- | ---
Disclosure of financial assets [Line Items] |  |  |
Other financial assets | $ 1,642,840 | $ 55,427 | $ 1,879,067
Current | 472,340 | 15,936 | 558,686
Non-current | 1,170,500 | 39,491 | 1,320,381
Unsecured subordinate corporate bonds [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Other financial assets | 1,000,000 | 33,738 | 1,000,000
Time deposits with original maturity of over three months [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Other financial assets | 405,520 | 13,682 | 480,736
Pledged time deposits [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Other financial assets | 59,456 | 2,006 | 206,530
Guaranty deposits [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Other financial assets | 170,594 | 5,756 | 178,103
Others [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Other financial assets | $ 7,270 | $ 245 | $ 13,698

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