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Investments Accounted for Using the Equity Method - Summarized Financial Information (Detail)
$ in Thousands, $ in Thousands
 4 Months Ended 12 Months Ended
Apr. 29, 2018
USD ($)
Apr. 29, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2015
TWD ($)
Disclosure of associates and joint ventures [line items]                    
Current assets     $ 6,584,738       $ 201,558,875   $ 144,938,272  
Non-current assets     10,862,563       332,503,052   218,984,000  
Current liabilities     (5,182,361)       (158,632,082)   (108,376,737)  
Non-current liabilities     (5,109,504)       (156,401,923)   (54,235,348)  
Equity     7,155,436     $ 166,841,165 219,027,922   201,310,187 $ 165,924,980
Goodwill     1,632,618     10,490,309 49,974,446 $ 324,551 9,934,494 10,506,519
Carrying amount     298,328       9,131,814   48,267,237  
Operating revenue     12,123,242 $ 371,092,421 $ 290,441,208 274,884,107        
Gross profit     1,998,140 61,163,050 52,732,271 53,187,185        
Profit before income tax     1,043,374 31,937,678 31,020,663 27,968,705        
Net profit     895,926 27,424,309 24,497,060 22,577,861        
Other comprehensive income (loss)     (27,855) (852,632) (4,637,933) (7,959,259)        
Total comprehensive income     868,071 $ 26,571,677 $ 19,859,127 14,618,602        
Cost [member]                    
Disclosure of associates and joint ventures [line items]                    
Goodwill     1,711,485     12,479,305 52,388,559 $ 403,418 12,348,607 $ 12,495,515
Carrying amount     $ 308,134       $ 9,431,963   48,567,386  
Siliconware Precision Industries Co., Ltd. [member]                    
Disclosure of associates and joint ventures [line items]                    
Current assets                 49,065,912  
Non-current assets                 101,693,417  
Current liabilities                 (26,194,615)  
Non-current liabilities                 (27,213,266)  
Equity                 97,351,448  
Proportion of the Group's ownership interest in SPIL         33.29%          
Net assets attributable to the Group                 32,408,297  
Goodwill                 12,802,074  
Operating revenue $ 854,918 $ 26,169,040     $ 83,554,385 85,111,913        
Gross profit 144,446 4,421,493     12,464,792 15,027,247        
Profit before income tax 27,706 848,072     4,347,810 7,351,661        
Net profit 13,503 413,317     2,822,231 5,484,462        
Other comprehensive income (loss) 20,708 633,879     579,057 (2,373,532)        
Total comprehensive income $ 34,211 $ 1,047,196     3,401,288 3,110,930        
Cash dividends received from SPIL         $ 1,815,275 $ 3,941,740        
Siliconware Precision Industries Co., Ltd. [member] | Cost [member]                    
Disclosure of associates and joint ventures [line items]                    
Carrying amount                 $ 45,210,371