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Business Combinations - Summary of Retrospective Adjustments of Intangible Assets (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 detailed information about business combination [Line Items]              
Goodwill $ 9,934,494   $ 10,490,309 $ 10,506,519 $ 335,172 $ 353,924 $ 10,445,415
Other intangible assets 1,406,865   1,617,261   $ 47,465    
OPERATING COSTS $ 237,708,937 $ 8,019,870 221,696,922 $ 233,167,308      
Operating expenses     26,526,815        
Previously stated [member]              
Disclosure of detailed information about business combination [Line Items]              
Goodwill     10,558,878        
Other intangible assets     1,560,989        
OPERATING COSTS     221,689,888        
Operating expenses     $ 26,485,716