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Cash Flows Information - Change in Liabilities Arising From Financing Activities (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure Of Non Cash Investing Activities [line items]      
Beginning balance $ 2,499,571 $ 76,511,879 $ 111,070,988
Financing cash flows 3,320,914 101,653,172 (19,636,346)
Non-cash changes      
Acquisition through business combinations (Note 30) 789,192 24,157,174  
Bonds conversion (145,612) (4,457,191) (11,650,369)
Reclassification for applying IFRS 9 (42,535) (1,301,994)  
Amortization of issuance cost 7,089 216,973 325,253
Effects of foreign currency exchange 44,682 1,367,721 (3,597,647)
Ending balance 6,473,301 198,147,734 76,511,879
Short-term borrowings [member]      
Disclosure Of Non Cash Investing Activities [line items]      
Beginning balance 586,817 17,962,471 20,955,522
Financing cash flows 729,429 22,327,813 (2,038,993)
Non-cash changes      
Acquisition through business combinations (Note 30) 118,257 3,619,858  
Reclassification for applying IFRS 9 (42,535) (1,301,994)  
Effects of foreign currency exchange 21,409 655,321 (954,058)
Ending balance 1,413,377 43,263,469 17,962,471
Bonds payable [member]      
Disclosure Of Non Cash Investing Activities [line items]      
Beginning balance 756,053 23,142,780 36,999,903
Financing cash flows (202,078) (6,185,600) (1,123,972)
Non-cash changes      
Acquisition through business combinations (Note 30) 145,612 4,457,191  
Bonds conversion (145,612) (4,457,191) (11,650,369)
Amortization of issuance cost 940 28,756 319,463
Effects of foreign currency exchange     (1,402,245)
Ending balance 554,915 16,985,936 23,142,780
Long-term borrowings [member]      
Disclosure Of Non Cash Investing Activities [line items]      
Beginning balance 1,156,701 35,406,628 53,115,563
Financing cash flows 2,793,563 85,510,959 (16,473,381)
Non-cash changes      
Acquisition through business combinations (Note 30) 525,323 16,080,125  
Amortization of issuance cost 6,149 188,217 5,790
Effects of foreign currency exchange 23,273 712,400 (1,241,344)
Ending balance $ 4,505,009 $ 137,898,329 $ 35,406,628