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Investments accounted for using equity method - Summarized Financial Information for Investment in Material Associates (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2020 USD ($)
Disclosure of associates [line items] |  |  |  |  |
Current assets | $ 12,356,103 |  | $ 11,762,346 |  | $ 440,032
Non-current assets | 22,724,711 |  | 22,543,541 |  | 809,285
Current liabilities | (5,725,631) |  | (5,018,861) |  | (203,904)
Non-current liabilities | (8,639,344) |  | (9,756,441) |  | $ (307,669)
Carrying amount | 3,271,677 |  | 3,392,910 |  |
Revenue | 23,011,381 | $ 819,493 | 20,337,881 | $ 18,480,027 |
Other comprehensive (loss) income, net of income tax | 115,308 | 4,107 | (127,266) | (32,829) |
Total comprehensive income for the year, net of income tax | 2,494,286 | $ 88,828 | 2,381,308 | 1,292,995 |
Unimos Shanghai [member] |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Current assets | 2,438,725 |  | 3,042,377 |  |
Non-current assets | 3,905,089 |  | 3,499,819 |  |
Current liabilities | (618,949) |  | (459,502) |  |
Non-current liabilities | (248,583) |  | (448,929) |  |
Total net assets | 5,476,282 |  | 5,633,765 |  |
Share in associate's net assets | 2,465,651 |  | 2,536,558 |  |
Depreciable assets | 533,139 |  | 584,441 |  |
Goodwill | 22,118 |  | 22,118 |  |
Carrying amount | 3,020,908 |  | 3,143,117 |  |
Revenue | 1,739,880 |  | 1,584,648 | 1,334,196 |
Profit (loss) for the year from continuing operations | (246,220) |  | (352,008) | (629,303) |
Other comprehensive (loss) income, net of income tax | 0 |  |  |  |
Total comprehensive income for the year, net of income tax | (246,220) |  | (352,008) | (629,303) |
Dividends received from the associate | 0 |  |  |  |
Individually Immaterial Associates [member] |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Carrying amount | 250,769 |  | 249,793 |  |
Profit (loss) for the year from continuing operations | 14,833 |  | 63,838 | 41,933 |
Other comprehensive (loss) income, net of income tax | 23,143 |  | 5,732 | (2,687) |
Total comprehensive income for the year, net of income tax | $ 37,976 |  | $ 69,570 | $ 39,246 |

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