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Financial Instruments - Summary of Maturity Analysis for Non-derivative Financial Liabilities (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
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Less than 1 month [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | $ 1,848,911 | $ 56,595,145 | $ 45,860,103
Less than 1 month [member] | Non interest bearing [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 1,083,177 | 33,156,044 | 30,695,797
Less than 1 month [member] | Floating interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 514,930 | 15,762,004 | 6,641,541
Less than 1 month [member] | Fixed interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 250,804 | 7,677,097 | 8,522,765
1 to 3 months [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 1,516,894 | 46,432,142 | 30,067,396
1 to 3 months [member] | Non interest bearing [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 1,126,854 | 34,493,000 | 18,387,296
1 to 3 months [member] | Floating interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 232,852 | 7,127,606 | 4,153,830
1 to 3 months [member] | Fixed interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 157,188 | 4,811,536 | 7,526,270
3 months to 1 year [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 1,066,719 | 32,652,272 | 11,177,095
3 months to 1 year [member] | Non interest bearing [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 225,387 | 6,899,093 | 4,549,468
3 months to 1 year [member] | Floating interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 833,411 | 25,510,718 | 5,101,178
3 months to 1 year [member] | Fixed interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 7,921 | 242,461 | 1,526,449
1-5 years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 4,726,992 | 144,693,229 | 39,101,387
1-5 years [member] | Non interest bearing [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 1,874 | 57,375 | 2,807
1-5 years [member] | Floating interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 4,280,106 | 131,014,040 | 27,196,245
1-5 years [member] | Fixed interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 445,012 | 13,621,814 | 11,902,335
More than 5 years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 149,104 | 4,564,069 | 7,538,905
More than 5 years [member] | Non interest bearing [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 6,420 | 196,523 | 176,199
More than 5 years [member] | Floating interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts |  |  | 900,310
More than 5 years [member] | Fixed interest rate [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | $ 142,684 | $ 4,367,546 | $ 6,462,396

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