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Operating Segments Information - Summary of Geographical 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 ($)
Disclosure of geographical areas [line items]          
OPERATING REVENUES $ 290,441,208 $ 9,798,961 $ 274,884,107 $ 283,302,536  
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets 163,752,501   158,415,041   $ 5,524,714
United States [Member]          
Disclosure of geographical areas [line items]          
OPERATING REVENUES 196,462,345 6,628,284 180,745,837 205,730,670  
Taiwan [member]          
Disclosure of geographical areas [line items]          
OPERATING REVENUES 35,413,647 1,194,792 38,868,679 32,631,149  
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets 93,350,839   97,337,094   3,149,489
Asia [Member]          
Disclosure of geographical areas [line items]          
OPERATING REVENUES 30,201,332 1,018,938 29,896,304 22,885,128  
Europe [Member]          
Disclosure of geographical areas [line items]          
OPERATING REVENUES 26,445,240 892,215 23,275,732 20,577,069  
Other geographical areas [member]          
Disclosure of geographical areas [line items]          
OPERATING REVENUES 1,918,644 $ 64,732 2,097,555 $ 1,478,520  
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets 25,025,498   26,935,370   844,315
China [member]          
Disclosure of geographical areas [line items]          
Noncurrent assets, excluding financial instruments, post-employment benefit assets and deferred tax assets $ 45,376,164   $ 34,142,577   $ 1,530,910