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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, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($)
--- | --- | --- | ---
Disclosure of provision matrix [line items] |  |  |
Gross carrying amount | $ 77,055,280 | $ 2,576,238 | $ 79,636,748
Loss allowance (Lifetime ECL) | (136,497) | (4,564) | (155,389)
Net Amount | $ 76,918,783 | $ 2,571,674 | $ 79,481,359
Not past due [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Expected credit loss rate | 0.00% | 0.00% | 0.00%
Gross carrying amount | $ 70,042,018 | $ 2,341,759 | $ 71,819,583
Loss allowance (Lifetime ECL) | (12,379) | (414) | (7,119)
Net Amount | 70,029,639 | 2,341,345 | 71,812,464
Less than 1 month [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Gross carrying amount | 6,111,309 | 204,323 | 6,537,819
Loss allowance (Lifetime ECL) | (841) | (28) | (4,463)
Net Amount | $ 6,110,468 | $ 204,295 | $ 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% | 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% | 10.00%
1 to 3 months [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Gross carrying amount | $ 695,384 | $ 23,249 | $ 778,799
Loss allowance (Lifetime ECL) | (26,587) | (889) | (14,949)
Net Amount | $ 668,797 | $ 22,360 | $ 763,850
1 to 3 months [member] | Bottom of range [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Expected credit loss rate | 1.00% | 1.00% | 0.00%
1 to 3 months [member] | Top of range [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Expected credit loss rate | 70.00% | 70.00% | 50.00%
More than 91 days [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Gross carrying amount | $ 153,458 | $ 5,131 | $ 405,707
Loss allowance (Lifetime ECL) | (53,629) | (1,793) | (40,080)
Net Amount | $ 99,829 | $ 3,338 | $ 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% | 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% | 100.00%
Individually impaired [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Gross carrying amount | $ 53,111 | $ 1,776 | $ 94,840
Loss allowance (Lifetime ECL) | (43,061) | (1,440) | (88,778)
Net Amount | $ 10,050 | $ 336 | $ 6,062
Individually impaired [member] | Bottom of range [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Expected credit loss rate | 50.00% | 50.00% | 0.00%
Individually impaired [member] | Top of range [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Expected credit loss rate | 100.00% | 100.00% | 100.00%

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