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Trade Receivables, Net - Summary of Trade Receivables, Net (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($)
--- | --- | --- | ---
Disclosure of financial assets [Line Items] |  |  |
Trade receivables | $ 55,200,706 | $ 1,862,372 | $ 51,145,557
Cost [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Trade receivables | 55,265,607 | 1,864,562 | 51,199,266
Allowance for doubtful debts [member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Trade receivables | $ 64,901 | $ 2,190 | $ 53,709

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