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Investments Accounted for Using the Equity Method - Summarized Financial Information (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2014 TWD ($)
Disclosure of associates and joint ventures [line items] |  |  |  |  |  |  |
Current assets | $ 144,938,272 |  | $ 142,789,659 |  | $ 4,889,955 |  |
Non-current assets | 218,984,000 |  | 215,140,917 |  | 7,388,124 |  |
Current liabilities | (108,376,737) |  | (106,969,574) |  | (3,656,434) |  |
Non-current liabilities | (54,235,348) |  | (84,119,837) |  | (1,829,803) |  |
Equity | 201,310,187 |  | 166,841,165 | $ 165,924,980 | 6,791,842 |  | $ 155,691,394
Goodwill | 9,934,494 |  | 10,490,309 | 10,506,519 | 335,172 | $ 353,924 | 10,445,415
Carrying amount | 48,267,237 |  | 49,154,140 |  | 1,628,449 |  |
Operating revenue | 290,441,208 | $ 9,798,961 | 274,884,107 | 283,302,536 |  |  |
Gross profit | 52,732,271 | 1,779,091 | 53,187,185 | 50,135,228 |  |  |
Profit before income tax | 31,020,663 | 1,046,581 | 27,968,705 | 25,011,788 |  |  |
Net profit for the year | 24,497,060 | 826,487 | 22,577,861 | 20,700,715 |  |  |
Other comprehensive income (loss) for the year | (4,637,933) | (156,475) | (7,959,259) | (147,547) |  |  |
Total comprehensive income for the year | 19,859,127 | $ 670,012 | 14,618,602 | 20,553,168 |  |  |
Cost [member] |  |  |  |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |  |  |  |
Goodwill | 12,348,607 |  | 12,479,305 | $ 12,495,515 | 416,620 | $ 421,029 | $ 12,434,411
Carrying amount | 48,567,386 |  | 49,454,289 |  | 1,638,576 |  |
Siliconware Precision Industries Co., Ltd. [member] |  |  |  |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |  |  |  |
Current assets | 49,065,912 |  | 50,451,295 |  | 1,655,395 |  |
Non-current assets | 101,693,417 |  | 107,573,251 |  | 3,430,952 |  |
Current liabilities | (26,194,615) |  | (41,088,439) |  | (883,759) |  |
Non-current liabilities | (27,213,266) |  | (17,518,410) |  | (918,126) |  |
Equity | $ 97,351,448 |  | $ 99,417,697 |  | 3,284,462 |  |
Proportion of the Group's ownership interest in SPIL | 33.29% | 33.29% | 33.29% |  |  |  |
Net assets attributable to the Group | $ 32,408,297 |  | $ 33,096,151 |  | 1,093,397 |  |
Goodwill | 12,802,074 |  | 12,802,074 |  | 431,919 |  |
Operating revenue | 83,554,385 | $ 2,818,974 | 85,111,913 |  |  |  |
Gross profit | 12,464,792 | 420,540 | 15,027,247 |  |  |  |
Profit before income tax | 4,347,810 | 146,687 | 7,351,661 |  |  |  |
Net profit for the year | 2,822,231 | 95,217 | 5,484,462 |  |  |  |
Other comprehensive income (loss) for the year | 579,057 | 19,536 | (2,373,532) |  |  |  |
Total comprehensive income for the year | 3,401,288 | 114,753 | 3,110,930 |  |  |  |
Cash dividends received from SPIL | 1,815,275 | $ 61,244 | 3,941,740 |  |  |  |
Siliconware Precision Industries Co., Ltd. [member] | Cost [member] |  |  |  |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |  |  |  |
Carrying amount | $ 45,210,371 |  | $ 45,898,225 |  | $ 1,525,316 |  |

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