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Application of New and Revised International Financial Reporting Standards As Issued By The International Accounting Standards Board - Summary of Anticipated Impact on Assets, Liabilities and Equity (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
TWD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial assets - current $ 765,834 $ 25,605     $ 6,539,467  
Other current assets 4,983,667 166,622     3,773,384  
Long-term prepayments for lease         10,764,835  
Property, plant and equipment 232,093,327 7,759,723     214,592,588  
Right-of-use assets 9,792,221 327,390        
Investment properties 12,854,071 429,758     7,738,379 $ 8,119,436
Other financial assets - non-current 559,493 18,706     1,044,294  
Other intangible assets 29,024,392 970,391     30,897,700  
Total assets 557,223,706 18,630,014     534,061,927  
Other current liabilities 6,652,925 222,432     5,984,156  
Other current liabilities - non-current 1,680,346 56,180     1,371,302  
Total liabilities $ 344,421,394 $ 11,515,259     $ 315,034,005  
IAS 17 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial assets - current     $ 6,539,467 $ 218,638    
Other current assets     3,773,384 126,158    
Long-term prepayments for lease     10,764,835 359,908    
Property, plant and equipment     214,592,588 7,174,610    
Investment properties     7,738,379 258,722    
Other financial assets - non-current     1,044,294 34,915    
Other intangible assets     30,897,700 1,033,022    
Total assets     275,350,647 9,205,973    
Other current liabilities     5,984,156 200,072    
Other current liabilities - non-current     1,371,302 45,848    
Total liabilities     7,355,458 245,920    
IFRS16 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Right-of-use assets     4,165,610 139,271    
Investment properties     6,599,225 220,636    
Increase (decrease) due to application of IFRS 16 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial assets - current     (31) (1)    
Other current assets     (385,014) (12,872)    
Long-term prepayments for lease     (10,764,835) (359,908)    
Property, plant and equipment     (277,079) (9,264)    
Right-of-use assets     10,720,769 358,434    
Investment properties     6,599,225 220,636    
Other financial assets - non-current     (2,745) (92)    
Other intangible assets     (59,667) (1,994)    
Total assets     5,830,623 194,939    
Obligation under leases - current     489,984 16,382    
Other current liabilities     (17,144) (573)    
Obligation under leases - non-current     5,594,745 187,053    
Other current liabilities - non-current     (236,962) (7,923)    
Total liabilities     5,830,623 194,939    
Non adjusting event [member] | IFRS16 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial assets - current     6,539,436 218,637    
Other current assets     3,388,370 113,286    
Property, plant and equipment     214,315,509 7,165,346    
Right-of-use assets     10,720,769 358,434    
Investment properties     14,337,604 479,358    
Other financial assets - non-current     1,041,549 34,823    
Other intangible assets     30,838,033 1,031,028    
Total assets     281,181,270 9,400,912    
Obligation under leases - current     489,984 16,382    
Other current liabilities     5,967,012 199,499    
Obligation under leases - non-current     5,594,745 187,053    
Other current liabilities - non-current     1,134,340 37,925    
Total liabilities     $ 13,186,081 $ 440,859