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Investments Accounted for Using the Equity Method - Summarized Financial Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2014
TWD ($)
Disclosure of associates and joint ventures [line items]              
Current assets $ 144,938,272   $ 142,789,659   $ 4,889,955    
Non-current assets 218,984,000   215,140,917   7,388,124    
Current liabilities (108,376,737)   (106,969,574)   (3,656,434)    
Non-current liabilities (54,235,348)   (84,119,837)   (1,829,803)    
Equity 201,310,187   166,841,165 $ 165,924,980 6,791,842   $ 155,691,394
Goodwill 9,934,494   10,490,309 10,506,519 335,172 $ 353,924 10,445,415
Carrying amount 48,267,237   49,154,140   1,628,449    
Operating revenue 290,441,208 $ 9,798,961 274,884,107 283,302,536      
Gross profit 52,732,271 1,779,091 53,187,185 50,135,228      
Profit before income tax 31,020,663 1,046,581 27,968,705 25,011,788      
Net profit for the year 24,497,060 826,487 22,577,861 20,700,715      
Other comprehensive income (loss) for the year (4,637,933) (156,475) (7,959,259) (147,547)      
Total comprehensive income for the year 19,859,127 $ 670,012 14,618,602 20,553,168      
Cost [member]              
Disclosure of associates and joint ventures [line items]              
Goodwill 12,348,607   12,479,305 $ 12,495,515 416,620 $ 421,029 $ 12,434,411
Carrying amount 48,567,386   49,454,289   1,638,576    
Siliconware Precision Industries Co., Ltd. [member]              
Disclosure of associates and joint ventures [line items]              
Current assets 49,065,912   50,451,295   1,655,395    
Non-current assets 101,693,417   107,573,251   3,430,952    
Current liabilities (26,194,615)   (41,088,439)   (883,759)    
Non-current liabilities (27,213,266)   (17,518,410)   (918,126)    
Equity $ 97,351,448   $ 99,417,697   3,284,462    
Proportion of the Group's ownership interest in SPIL 33.29% 33.29% 33.29%        
Net assets attributable to the Group $ 32,408,297   $ 33,096,151   1,093,397    
Goodwill 12,802,074   12,802,074   431,919    
Operating revenue 83,554,385 $ 2,818,974 85,111,913        
Gross profit 12,464,792 420,540 15,027,247        
Profit before income tax 4,347,810 146,687 7,351,661        
Net profit for the year 2,822,231 95,217 5,484,462        
Other comprehensive income (loss) for the year 579,057 19,536 (2,373,532)        
Total comprehensive income for the year 3,401,288 114,753 3,110,930        
Cash dividends received from SPIL 1,815,275 $ 61,244 3,941,740        
Siliconware Precision Industries Co., Ltd. [member] | Cost [member]              
Disclosure of associates and joint ventures [line items]              
Carrying amount $ 45,210,371   $ 45,898,225   $ 1,525,316