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Trade Receivables, Net - Summary of Loss Allowance of Trade Receivables Based on Group's Provision Matrix (Detail) - Trade receivables [member]
$ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Disclosure of provision matrix [line items]    
Gross carrying amount $ 2,601,658 $ 79,636,748
Loss allowance (Lifetime ECL) (5,077) (155,389)
Amortized cost $ 2,596,581 $ 79,481,359
Not past due [member]    
Disclosure of provision matrix [line items]    
Expected credit loss rate 0.00% 0.00%
Gross carrying amount $ 2,346,278 $ 71,819,583
Loss allowance (Lifetime ECL) (233) (7,119)
Amortized cost 2,346,045 71,812,464
Less than 1 month [member]    
Disclosure of provision matrix [line items]    
Gross carrying amount 213,585 6,537,819
Loss allowance (Lifetime ECL) (147) (4,463)
Amortized cost $ 213,438 $ 6,533,356
Less than 1 month [member] | Bottom of range [member]    
Disclosure of provision matrix [line items]    
Expected credit loss rate 0.00% 0.00%
Less than 1 month [member] | Top of range [member]    
Disclosure of provision matrix [line items]    
Expected credit loss rate 10.00% 10.00%
1 to 3 months [member]    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 25,443 $ 778,799
Loss allowance (Lifetime ECL) (488) (14,949)
Amortized cost $ 24,955 $ 763,850
1 to 3 months [member] | Bottom of range [member]    
Disclosure of provision matrix [line items]    
Expected credit loss rate 0.00% 0.00%
1 to 3 months [member] | Top of range [member]    
Disclosure of provision matrix [line items]    
Expected credit loss rate 50.00% 50.00%
More than 91 days [member]    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 13,254 $ 405,707
Loss allowance (Lifetime ECL) (1,309) (40,080)
Amortized cost $ 11,945 $ 365,627
More than 91 days [member] | Bottom of range [member]    
Disclosure of provision matrix [line items]    
Expected credit loss rate 1.00% 1.00%
More than 91 days [member] | Top of range [member]    
Disclosure of provision matrix [line items]    
Expected credit loss rate 100.00% 100.00%
Individually impaired [member]    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 3,098 $ 94,840
Loss allowance (Lifetime ECL) (2,900) (88,778)
Amortized cost $ 198 $ 6,062
Individually impaired [member] | Bottom of range [member]    
Disclosure of provision matrix [line items]    
Expected credit loss rate 0.00% 0.00%
Individually impaired [member] | Top of range [member]    
Disclosure of provision matrix [line items]    
Expected credit loss rate 100.00% 100.00%