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Effects on Initial Application of IFRS 15 and Information for the Year Ended December 31, 2017 in Conformity With IAS 18 - Impact and Description on Consolidated Statement of Financial Position and Statement of Comprehensive Income (Detail)
$ / shares in Units, $ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
$ / shares
Dec. 31, 2017
TWD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2018
TWD ($)
Disclosure of financial assets [Line Items]            
Contract assets $ 377,869   $ 299,835     $ 254,997
Inventories 1,767,642   1,778,835   $ 59,099  
Deferred tax assets 194,552   226,716 $ 212,372 6,505  
Contract liabilities 1,231   1,432     $ 1,152
Receipts in advance 988   1,013   33  
Current provisions 1,998   29,352   67  
Retained earnings 4,651,215   3,602,663   $ 155,507  
Revenue 20,337,881 $ 679,969 18,480,027 17,940,855    
Cost of revenue (16,411,742) (548,704) (15,050,032) (14,703,729)    
Operating expenses 92,928 3,107 147,514 692,834    
Other non-operating income (expenses), net (73,287) (2,450) 173,070 (327,620)    
Income tax expense 513,679 17,174 456,618 550,487    
Profit for the year $ 2,508,574 $ 83,871 1,325,824 $ 2,796,882    
IFRS 15 [member]            
Disclosure of financial assets [Line Items]            
Contract assets     299,835      
Inventories     1,778,835      
Deferred tax assets     226,716      
Contract liabilities     1,432      
Receipts in advance     1,013      
Current provisions     29,352      
Current refund liabilities     32,627      
Retained earnings     3,602,663      
Revenue     18,480,027      
Cost of revenue     (15,050,032)      
Operating expenses     (1,477,788)      
Other non-operating income (expenses), net     173,070      
Income tax expense     (456,618)      
Profit for the year     $ 1,325,824      
Earnings per share (in dollars)            
Basic | $ / shares     $ 1.65      
Diluted | $ / shares     $ 1.63      
Previously stated [member]            
Disclosure of financial assets [Line Items]            
Inventories     $ 2,016,106      
Deferred tax assets     226,635      
Receipts in advance     2,445      
Current provisions     61,979      
Retained earnings     3,540,018      
Revenue     18,434,763      
Cost of revenue     (15,021,266)      
Operating expenses     (1,477,653)      
Other non-operating income (expenses), net     173,476      
Income tax expense     (465,392)      
Profit for the year     $ 1,301,093      
Earnings per share (in dollars)            
Basic | $ / shares     $ 1.62      
Diluted | $ / shares     $ 1.60      
Increase (decrease) due to changes in accounting policy [member]            
Disclosure of financial assets [Line Items]            
Contract assets     $ 299,835      
Inventories     (237,271)      
Deferred tax assets     81      
Contract liabilities     1,432      
Receipts in advance     (1,432)      
Current provisions     (32,627)      
Current refund liabilities     32,627      
Retained earnings     62,645      
Revenue     45,264      
Cost of revenue     (28,766)      
Operating expenses     (135)      
Other non-operating income (expenses), net     (406)      
Income tax expense     8,774      
Profit for the year     $ 24,731      
Earnings per share (in dollars)            
Basic | $ / shares     $ 0.03      
Diluted | $ / shares     $ 0.03