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Financial Instruments - Summary of Detailed Information about Maturity Analysis of Obligation under Leases (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Less than 1 year [member] | Obligation under leases [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts $ 875,563 $ 31,181 $ 723,432
1-5 years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 151,252,482 5,386,485 169,317,078
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 1,779,041 63,356 1,536,600
5 to 10 Years [member] | Obligation under leases [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 1,422,331 50,653 1,454,128
10 to 15 Years [member] | Obligation under leases [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 776,735 27,661 856,825
15 to 20 Years [member] | Obligation under leases [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts 674,446 24,019 712,696
More than 20 Years [member] | Obligation under leases [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Non-derivative financial liabilities undiscounted amounts $ 1,214,789 $ 43,262 $ 1,389,210