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Financial Instruments - Summary of Maturity Analysis for Non-derivative Financial Liabilities (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 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 | $ 52,919,574 | $ 1,769,293 | $ 56,595,145
Less than 1 month [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 75,388 | 2,520 |
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 | 35,283,757 | 1,179,664 | 33,156,044
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 | 10,740,844 | 359,105 | 15,762,004
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 | 6,819,585 | 228,004 | 7,677,097
1 to 3 months [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 49,340,483 | 1,649,632 | 46,432,142
1 to 3 months [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 115,297 | 3,855 |
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 | 38,803,904 | 1,297,356 | 34,493,000
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 | 6,708,303 | 224,283 | 7,127,606
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 | 3,712,979 | 124,138 | 4,811,536
3 months to 1 year [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 29,672,377 | 992,056 | 32,652,272
3 months to 1 year [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 532,747 | 17,812 |
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 | 7,989,256 | 267,110 | 6,899,093
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 | 18,868,999 | 630,859 | 25,510,718
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 | 2,281,375 | 76,275 | 242,461
1-5 years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 169,317,078 | 5,660,885 | 144,693,229
1-5 years [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 1,536,600 | 51,374 |
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 | 33,797 | 1,130 | 57,375
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 | 133,341,087 | 4,458,077 | 131,014,040
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 | 34,405,594 | 1,150,304 | 13,621,814
More than 5 years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 15,477,307 | 517,463 | 4,564,069
More than 5 years [member] | Obligation under leases [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Non-derivative financial liabilities undiscounted amounts | 4,412,859 | 147,538 |
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 | 184,338 | 6,163 | 196,523
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 | 7,190,891 | 240,418 |
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 | $ 3,689,219 | $ 123,344 | $ 4,367,546

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