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Financial Instruments - Reconciliation of Liabilities Arising From Financing Activities (Detail) - 12 months ended Dec. 31, 2017
$ in Thousands, $ in Thousands
TWD ($)
USD ($)
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance $ 111,070,988 $ 3,747,334
Financing cash flows (19,636,346) (662,494)
Non-cash changes    
Amortization of issuance cost 325,253 10,973
Converted to ordinary shares in current period (11,650,369) (393,062)
Effects of exchange rate changes (3,597,647) (121,379)
Ending balance 76,511,879 2,581,372
Short-term borrowings [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 20,955,522 707,001
Financing cash flows (2,038,993) (68,792)
Non-cash changes    
Effects of exchange rate changes (954,058) (32,188)
Ending balance 17,962,471 606,021
Bonds payable [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 36,999,903 1,248,310
Financing cash flows (1,123,972) (37,920)
Non-cash changes    
Amortization of issuance cost 319,463 10,778
Converted to ordinary shares in current period (11,650,369) (393,062)
Effects of exchange rate changes (1,402,245) (47,310)
Ending balance 23,142,780 780,796
Long-term borrowings [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 53,115,563 1,792,023
Financing cash flows (16,473,381) (555,782)
Non-cash changes    
Amortization of issuance cost 5,790 195
Effects of exchange rate changes (1,241,344) (41,881)
Ending balance $ 35,406,628 $ 1,194,555