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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
Jan. 01, 2019
USD ($)
Jan. 01, 2019
TWD ($)
Dec. 31, 2018
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     $ 213,638 $ 6,539,467 $ 472,340
Other current assets     123,273 3,773,384 2,482,010
Long-term prepayments for lease     351,677 10,764,835 8,851,330
Property, plant and equipment     7,010,539 214,592,588 135,168,406
Investment properties     252,806 7,738,379 8,119,436
Other financial assets - non-current     34,116 1,044,294 1,170,500
Other intangible assets     1,009,399 30,897,700 1,406,865
Total assets     17,447,301 534,061,927 363,922,272
Other current liabilities     195,497 5,984,156 4,644,566
Other current liabilities - non-current     44,799 1,371,302 1,210,590
Total liabilities     10,291,865 315,034,005 $ 162,612,085
IAS 17 [member]          
Disclosure of expected impact of initial application of new standards or interpretations [line items]          
Other financial assets - current     213,638 6,539,467  
Other current assets     123,273 3,773,384  
Long-term prepayments for lease     351,677 10,764,835  
Property, plant and equipment     7,010,539 214,592,588  
Investment properties     252,806 7,738,379  
Other financial assets - non-current     34,116 1,044,294  
Other intangible assets     1,009,399 30,897,700  
Total assets     8,995,448 275,350,647  
Other current liabilities     195,497 5,984,156  
Other current liabilities - non-current     44,799 1,371,302  
Total liabilities     240,296 7,355,458  
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     (1) (31)  
Other current assets     (12,578) (385,014)  
Long-term prepayments for lease     (351,677) (10,764,835)  
Property, plant and equipment     (9,052) (277,079)  
Right-of-use assets     350,349 10,724,198  
Investment properties     215,591 6,599,225  
Other financial assets - non-current     (90) (2,747)  
Other intangible assets     (1,949) (59,667)  
Total assets     190,593 5,834,050  
Obligation under leases - current     16,010 490,085  
Other current liabilities     (560) (17,144)  
Obligation under leases - non-current     182,884 5,598,071  
Other current liabilities - non-current     (7,741) (236,962)  
Total liabilities     $ 190,593 $ 5,834,050  
Non adjusting event [member] | IFRS 16 [member]          
Disclosure of expected impact of initial application of new standards or interpretations [line items]          
Other financial assets - current $ 213,637 $ 6,539,436      
Other current assets 110,695 3,388,370      
Property, plant and equipment 7,001,487 214,315,509      
Right-of-use assets 350,349 10,724,198      
Investment properties 468,397 14,337,604      
Other financial assets - non-current 34,026 1,041,547      
Other intangible assets 1,007,450 30,838,033      
Total assets 9,168,041 281,184,697      
Obligation under leases - current 16,010 490,085      
Other current liabilities 194,937 5,967,012      
Obligation under leases - non-current 182,884 5,598,071      
Other current liabilities - non-current 37,058 1,134,340      
Total liabilities $ 430,889 $ 13,189,508