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Trade Receivables, Net - Summary of Loss Allowance of Trade Receivables Based on Group's Provision Matrix (Detail) - Trade receivables [member] $ in Thousands, $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($)
--- | --- | ---
Disclosure of provision matrix [line items] |  |
Gross carrying amount | $ 2,601,658 | $ 79,636,748
Loss allowance (Lifetime ECL) | (5,077) | (155,389)
Amortized cost | $ 2,596,581 | $ 79,481,359
Not past due [member] |  |
Disclosure of provision matrix [line items] |  |
Expected credit loss rate | 0.00% | 0.00%
Gross carrying amount | $ 2,346,278 | $ 71,819,583
Loss allowance (Lifetime ECL) | (233) | (7,119)
Amortized cost | 2,346,045 | 71,812,464
Less than 1 month [member] |  |
Disclosure of provision matrix [line items] |  |
Gross carrying amount | 213,585 | 6,537,819
Loss allowance (Lifetime ECL) | (147) | (4,463)
Amortized cost | $ 213,438 | $ 6,533,356
Less than 1 month [member] | Bottom of range [member] |  |
Disclosure of provision matrix [line items] |  |
Expected credit loss rate | 0.00% | 0.00%
Less than 1 month [member] | Top of range [member] |  |
Disclosure of provision matrix [line items] |  |
Expected credit loss rate | 10.00% | 10.00%
1 to 3 months [member] |  |
Disclosure of provision matrix [line items] |  |
Gross carrying amount | $ 25,443 | $ 778,799
Loss allowance (Lifetime ECL) | (488) | (14,949)
Amortized cost | $ 24,955 | $ 763,850
1 to 3 months [member] | Bottom of range [member] |  |
Disclosure of provision matrix [line items] |  |
Expected credit loss rate | 0.00% | 0.00%
1 to 3 months [member] | Top of range [member] |  |
Disclosure of provision matrix [line items] |  |
Expected credit loss rate | 50.00% | 50.00%
More than 91 days [member] |  |
Disclosure of provision matrix [line items] |  |
Gross carrying amount | $ 13,254 | $ 405,707
Loss allowance (Lifetime ECL) | (1,309) | (40,080)
Amortized cost | $ 11,945 | $ 365,627
More than 91 days [member] | Bottom of range [member] |  |
Disclosure of provision matrix [line items] |  |
Expected credit loss rate | 1.00% | 1.00%
More than 91 days [member] | Top of range [member] |  |
Disclosure of provision matrix [line items] |  |
Expected credit loss rate | 100.00% | 100.00%
Individually impaired [member] |  |
Disclosure of provision matrix [line items] |  |
Gross carrying amount | $ 3,098 | $ 94,840
Loss allowance (Lifetime ECL) | (2,900) | (88,778)
Amortized cost | $ 198 | $ 6,062
Individually impaired [member] | Bottom of range [member] |  |
Disclosure of provision matrix [line items] |  |
Expected credit loss rate | 0.00% | 0.00%
Individually impaired [member] | Top of range [member] |  |
Disclosure of provision matrix [line items] |  |
Expected credit loss rate | 100.00% | 100.00%

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