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Segment Information - Geographic Information of Revenue (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($)
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | $ 23,011,381 | $ 819,493 | $ 20,337,881 | $ 18,480,027
ROC [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | 18,341,726 |  | 15,875,027 | 14,751,766
Japan [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | 1,291,026 |  | 1,905,032 | 1,825,479
Singapore [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | 1,838,394 |  | 1,333,114 | 1,143,661
People's Republic of China ("PRC") [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | 1,105,535 |  | 789,496 | 163,831
Others [member] |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |
Revenue | $ 434,700 |  | $ 435,212 | $ 595,290

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