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Application of New and Revised International Financial Reporting Standards As Issued By The International Accounting Standards Board - Summary of Anticipated Impact on Assets, Liabilities and Equity (Detail) $ in Thousands, $ in Thousands | Jan. 01, 2019 USD ($) | Jan. 01, 2019 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
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Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |
Other financial assets - current |  |  | $ 213,638 | $ 6,539,467 | $ 472,340
Other current assets |  |  | 123,273 | 3,773,384 | 2,482,010
Long-term prepayments for lease |  |  | 351,677 | 10,764,835 | 8,851,330
Property, plant and equipment |  |  | 7,010,539 | 214,592,588 | 135,168,406
Investment properties |  |  | 252,806 | 7,738,379 | 8,119,436
Other financial assets - non-current |  |  | 34,116 | 1,044,294 | 1,170,500
Other intangible assets |  |  | 1,009,399 | 30,897,700 | 1,406,865
Total assets |  |  | 17,447,301 | 534,061,927 | 363,922,272
Other current liabilities |  |  | 195,497 | 5,984,156 | 4,644,566
Other current liabilities - non-current |  |  | 44,799 | 1,371,302 | 1,210,590
Total liabilities |  |  | 10,291,865 | 315,034,005 | $ 162,612,085
IAS 17 [member] |  |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |
Other financial assets - current |  |  | 213,638 | 6,539,467 |
Other current assets |  |  | 123,273 | 3,773,384 |
Long-term prepayments for lease |  |  | 351,677 | 10,764,835 |
Property, plant and equipment |  |  | 7,010,539 | 214,592,588 |
Investment properties |  |  | 252,806 | 7,738,379 |
Other financial assets - non-current |  |  | 34,116 | 1,044,294 |
Other intangible assets |  |  | 1,009,399 | 30,897,700 |
Total assets |  |  | 8,995,448 | 275,350,647 |
Other current liabilities |  |  | 195,497 | 5,984,156 |
Other current liabilities - non-current |  |  | 44,799 | 1,371,302 |
Total liabilities |  |  | 240,296 | 7,355,458 |
Increase (decrease) due to application of IFRS 16 [member] |  |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |
Other financial assets - current |  |  | (1) | (31) |
Other current assets |  |  | (12,578) | (385,014) |
Long-term prepayments for lease |  |  | (351,677) | (10,764,835) |
Property, plant and equipment |  |  | (9,052) | (277,079) |
Right-of-use assets |  |  | 350,349 | 10,724,198 |
Investment properties |  |  | 215,591 | 6,599,225 |
Other financial assets - non-current |  |  | (90) | (2,747) |
Other intangible assets |  |  | (1,949) | (59,667) |
Total assets |  |  | 190,593 | 5,834,050 |
Obligation under leases - current |  |  | 16,010 | 490,085 |
Other current liabilities |  |  | (560) | (17,144) |
Obligation under leases - non-current |  |  | 182,884 | 5,598,071 |
Other current liabilities - non-current |  |  | (7,741) | (236,962) |
Total liabilities |  |  | $ 190,593 | $ 5,834,050 |
Non adjusting event [member] | IFRS 16 [member] |  |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |
Other financial assets - current | $ 213,637 | $ 6,539,436 |  |  |
Other current assets | 110,695 | 3,388,370 |  |  |
Property, plant and equipment | 7,001,487 | 214,315,509 |  |  |
Right-of-use assets | 350,349 | 10,724,198 |  |  |
Investment properties | 468,397 | 14,337,604 |  |  |
Other financial assets - non-current | 34,026 | 1,041,547 |  |  |
Other intangible assets | 1,007,450 | 30,838,033 |  |  |
Total assets | 9,168,041 | 281,184,697 |  |  |
Obligation under leases - current | 16,010 | 490,085 |  |  |
Other current liabilities | 194,937 | 5,967,012 |  |  |
Obligation under leases - non-current | 182,884 | 5,598,071 |  |  |
Other current liabilities - non-current | 37,058 | 1,134,340 |  |  |
Total liabilities | $ 430,889 | $ 13,189,508 |  |  |

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