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Application of New and Revised International Financial Reporting Standards As Issued By The International Accounting Standards Board - Schedule of Differences Between IFRS and IAS 18 Due to Adoption of IAS18 (Detail)
$ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2018
TWD ($)
$ / shares
Dec. 31, 2017
TWD ($)
$ / shares
Dec. 31, 2016
TWD ($)
$ / shares
Dec. 31, 2018
TWD ($)
Disclosure of initial application of standards or interpretations [line items]          
Increase in inventories $ (302,179) $ (9,249,714) $ (2,907,848) $ 3,156,759  
Decrease in non-controlling interests 386,156 11,820,227 246,440 3,063,623  
Decrease in operating revenues (12,123,242) (371,092,421) (290,441,208) (274,884,107)  
Decrease in operating costs (10,125,102) (309,929,371) (237,708,937) (221,696,922)  
Increase in share of profit of associates and joint ventures (15,689) (480,244) 525,782 1,503,910  
Decrease in income tax expense 147,448 4,513,369 6,523,603 5,390,844  
TOTAL COMPREHENSIVE INCOME FOR THE YEAR $ 868,071 $ 26,571,677 $ 19,859,127 $ 14,618,602  
Decrease in basic earnings per share | (per share) $ 0.20 $ 6.18 $ 5.59 $ 5.57  
Decrease in diluted earnings per share | (per share) $ 0.20 $ 6.07 $ 5.19 $ 4.66  
IAS 18 [member]          
Disclosure of initial application of standards or interpretations [line items]          
Increase in inventories $ 75,572 $ 2,313,269      
Decrease in contract assets - current (146,961) (4,498,500)      
Increase in trade receivables 35,066       $ 1,073,368
Decrease in investments accounted for using the equity method (1,219)       (37,312)
Increase in deferred tax assets 862       26,389
Decrease in assets (36,680) (1,122,786)      
Decrease in current tax liabilities (1,536)       (47,028)
Decrease in deferred tax liabilities (4,637) (141,934)      
Decrease in liabilities (6,173) (188,962)      
Decrease in retained earnings (30,490) (933,310)      
Decrease in non-controlling interests (17) (514)      
Decrease in equity (30,507)       $ (933,824)
Decrease in operating revenues (15,523) (475,155)      
Decrease in operating costs (3,331) (101,964)      
Increase in share of profit of associates and joint ventures 92 2,828      
Decrease in income tax expense (2,676) (81,908)      
Decrease in net profit and total comprehensive income for the year (13,290) (406,792)      
Increase (decrease) in net profit and total comprehensive income attributable to: Owners of the Company (13,442) (411,461)      
Non-controlling interests 152 4,669      
TOTAL COMPREHENSIVE INCOME FOR THE YEAR $ (13,290) $ (406,792)      
IAS 18 [member] | New Taiwan Dollar [member]          
Disclosure of initial application of standards or interpretations [line items]          
Decrease in basic earnings per share   $ (0.10)      
Decrease in diluted earnings per share   $ (0.10)      
IAS 18 [member] | US Dollar [member]          
Disclosure of initial application of standards or interpretations [line items]          
Decrease in basic earnings per share $ 0.00        
Decrease in diluted earnings per share $ 0.00