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Significant Contingent Liabilities and Unrecognized Commitments - Additional Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2013
TWD ($)
Feb. 28, 2019
USD ($)
Feb. 28, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure of contingent liabilities [line items]              
Unused letters of credit $ 20,712   $ 20,000       $ 634,000
Committed to purchase property, plant and equipment 556,663   7,019,377       $ 17,039,458
Prepayment of property, plant and equipment 76,423 $ 2,339,308 294,194        
Construction contract related to real estate business $ 29,012 $ 888,052 $ 1,548,806        
Announcing or commencing implementation of major restructuring [member]              
Disclosure of contingent liabilities [line items]              
Contribution to be made for environmental protection         $ 3,267 $ 100,000  
Taiwan [member]              
Disclosure of contingent liabilities [line items]              
Contractual period for environmental protection       30 years      
Contribution to be made for environmental protection       $ 3,000,000