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Application of New and Revised International Financial Reporting Standards as Issued by the International Accounting Standards Board ("IASB") ( Collectively, "IFRSs") - Schedule of Anticipated Impact on Assets, Liabilities and Equity Of Retrospective Application of the Requirements for the Classification, Measurement and Impairment of Financial Assets (Detail) $ in Thousands, $ in Thousands | Jan. 01, 2018 TWD ($) | Jan. 01, 2018 USD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($) | Dec. 31, 2014 TWD ($)
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Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |  |  |
Financial assets at fair value through profit or loss - current |  |  | $ 5,223,067 | $ 176,217 | $ 3,069,812 |  |
Inventories |  |  | 24,260,911 | 818,519 | 21,438,062 |  |
Available-for-sale financial assets - current |  |  | 89,159 | 3,008 | 266,696 |  |
Investments accounted for using the equity method |  |  | 48,753,751 | 1,644,863 | 49,824,690 | $ 37,122,244 |
Deferred tax assets |  |  | 4,001,821 | 135,014 | 4,536,924 |  |
Available-for-sale financial assets - non-current |  |  | 1,123,006 | 37,888 | 1,028,338 |  |
Other financial assets-non-current |  |  | 1,170,500 | 39,491 | 1,320,381 |  |
TOTAL |  |  | 363,922,272 | 12,278,079 | 357,930,576 | 364,986,892 |
Current tax liabilities |  |  | 7,619,328 | 257,062 | 6,846,350 |  |
Deferred tax liabilities |  |  | 4,961,487 | 167,392 | 4,856,549 |  |
Total effect on liabilities |  |  | 162,612,085 | 5,486,237 | 191,089,411 |  |
Retained earnings |  |  | 73,718,545 | 2,487,131 | 62,139,524 |  |
NON-CONTROLLING INTERESTS |  |  | 13,190,129 | 445,011 | 12,000,551 |  |
Unrealized gain on debt investments at fair value through other comprehensive income |  |  | 214,022 | 7,221 | 214,022 |  |
Total effect on equity |  |  | 201,310,187 | 6,791,842 | $ 166,841,165 | $ 165,924,980 | $ 155,691,394
IFRS9 [member] |  |  |  |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |  |  |
Financial assets at fair value through profit or loss - current |  |  | 5,223,067 | 176,217 |  |  |
Available-for-sale financial assets - current |  |  | 89,159 | 3,008 |  |  |
Investments accounted for using the equity method |  |  | 48,753,751 | 1,644,863 |  |  |
Available-for-sale financial assets - non-current |  |  | 1,123,006 | 37,888 |  |  |
Other financial assets-non-current |  |  | 1,170,500 | 39,491 |  |  |
TOTAL |  |  | 56,359,483 | 1,901,467 |  |  |
Retained earnings |  |  | 73,718,545 | 2,487,131 |  |  |
Unrealized gain on available-for-sale financial assets |  |  | 422,570 | 14,257 |  |  |
Total effect on equity |  |  | 74,141,115 | 2,501,388 |  |  |
Adoption of IFRS 15 [member] |  |  |  |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |  |  |
Inventories |  |  | 24,260,911 | 818,519 |  |  |
Investments accounted for using the equity method |  |  | 48,753,751 | 1,644,863 |  |  |
Deferred tax assets |  |  | 4,001,821 | 135,014 |  |  |
TOTAL |  |  | 77,016,483 | 2,598,396 |  |  |
Current tax liabilities |  |  | 7,619,328 | 257,062 |  |  |
Deferred tax liabilities |  |  | 4,961,487 | 167,392 |  |  |
Total effect on liabilities |  |  | 12,580,815 | 424,454 |  |  |
Retained earnings |  |  | 73,718,545 | 2,487,131 |  |  |
NON-CONTROLLING INTERESTS |  |  | 13,190,129 | 445,011 |  |  |
Total effect on equity |  |  | $ 86,908,674 | $ 2,932,142 |  |  |
Subsequent Event [Member] | IFRS9 [member] |  |  |  |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |  |  |
Financial assets at fair value through profit or loss - current | $ 5,312,226 | $ 179,225 |  |  |  |  |
Investments accounted for using the equity method | 48,751,165 | 1,644,776 |  |  |  |  |
Financial assets at fair value through profit or loss - non-current | 214,457 | 7,235 |  |  |  |  |
Financial assets at fair value through other comprehensive income - non-current | 1,988,549 | 67,090 |  |  |  |  |
Other financial assets-non-current | 170,500 | 5,753 |  |  |  |  |
TOTAL | 56,436,897 | 1,904,079 |  |  |  |  |
Retained earnings | 74,083,012 | 2,499,428 |  |  |  |  |
Unrealized gain on equity investments at fair value through other comprehensive income | 55,517 | 1,873 |  |  |  |  |
Unrealized gain on debt investments at fair value through other comprehensive income | 80,000 | 2,699 |  |  |  |  |
Total effect on equity | 74,218,529 | 2,504,000 |  |  |  |  |
Subsequent Event [Member] | Adoption of IFRS 15 [member] |  |  |  |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |  |  |
Inventories | 22,879,133 | 771,900 |  |  |  |  |
Contract assets - current | 1,971,107 | 66,502 |  |  |  |  |
Investments accounted for using the equity method | 48,793,890 | 1,646,217 |  |  |  |  |
Deferred tax assets | 3,994,534 | 134,768 |  |  |  |  |
TOTAL | 77,638,664 | 2,619,387 |  |  |  |  |
Current tax liabilities | 7,624,406 | 257,233 |  |  |  |  |
Deferred tax liabilities | 5,051,558 | 170,431 |  |  |  |  |
Total effect on liabilities | 12,675,964 | 427,664 |  |  |  |  |
Retained earnings | 74,240,394 | 2,504,737 |  |  |  |  |
NON-CONTROLLING INTERESTS | 13,195,312 | 445,186 |  |  |  |  |
Total effect on equity | 87,435,706 | 2,949,923 |  |  |  |  |
Subsequent Event [Member] | Adjustments arising from initial application [member] | IFRS9 [member] |  |  |  |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |  |  |
Financial assets at fair value through profit or loss - current | 89,159 | 3,008 |  |  |  |  |
Available-for-sale financial assets - current | (89,159) | (3,008) |  |  |  |  |
Investments accounted for using the equity method | (2,586) | (87) |  |  |  |  |
Financial assets at fair value through profit or loss - non-current | 214,457 | 7,235 |  |  |  |  |
Financial assets at fair value through other comprehensive income - non-current | 1,988,549 | 67,090 |  |  |  |  |
Available-for-sale financial assets - non-current | (1,123,006) | (37,888) |  |  |  |  |
Other financial assets-non-current | (1,000,000) | (33,738) |  |  |  |  |
TOTAL | 77,414 | 2,612 |  |  |  |  |
Retained earnings | 364,467 | 12,297 |  |  |  |  |
Unrealized gain on equity investments at fair value through other comprehensive income | 55,517 | 1,873 |  |  |  |  |
Unrealized gain on available-for-sale financial assets | (422,570) | (14,257) |  |  |  |  |
Unrealized gain on debt investments at fair value through other comprehensive income | 80,000 | 2,699 |  |  |  |  |
Total effect on equity | 77,414 | 2,612 |  |  |  |  |
Subsequent Event [Member] | Adjustments arising from initial application [member] | Adoption of IFRS 15 [member] |  |  |  |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |  |  |
Inventories | (1,381,778) | (46,619) |  |  |  |  |
Contract assets - current | 1,971,107 | 66,502 |  |  |  |  |
Investments accounted for using the equity method | 40,139 | 1,354 |  |  |  |  |
Deferred tax assets | (7,287) | (246) |  |  |  |  |
TOTAL | 622,181 | 20,991 |  |  |  |  |
Current tax liabilities | 5,078 | 171 |  |  |  |  |
Deferred tax liabilities | 90,071 | 3,039 |  |  |  |  |
Total effect on liabilities | 95,149 | 3,210 |  |  |  |  |
Retained earnings | 521,849 | 17,606 |  |  |  |  |
NON-CONTROLLING INTERESTS | 5,183 | 175 |  |  |  |  |
Total effect on equity | $ 527,032 | $ 17,781 |  |  |  |  |

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