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Trade Receivables, Net - Summary of Aging of Receivables Past Due but Not Impaired (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($)
--- | --- | --- | ---
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Trade receivables | $ 55,200,706 | $ 1,862,372 | $ 51,145,557
Past due but not impaired [member] |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Trade receivables | 5,321,203 | 179,528 | 5,046,126
Past due but not impaired [member] | 1 to 30 days [member] |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Trade receivables | 4,942,677 | 166,757 | 4,449,479
Past due but not impaired [member] | 1 to 3 months [member] |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Trade receivables | $ 378,526 | $ 12,771 | $ 596,647

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