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Significant Contingent Liabilities and Unrecognized Commitments - Additional Information (Detail)
$ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2022
USD ($)
Disclosure of contingent liabilities [line items]            
Unused letters of credit   $ 579,000   $ 74,000   $ 18,842
Committed to purchase property, plant and equipment   59,675,567   52,678,554   1,941,932
Prepayment of property, plant and equipment   3,689,863 $ 120,074 3,761,120    
Construction contract related to real estate business     59    
Letter of credits   622,539   738,628   20,258
Approved contribution in consideration of corporate social responsibility for environmental protection   100,000       3,254
Amount contributed related party transactions   120,000 3,805 110,000 $ 100,000  
ASE Cultural and Educational Foundation [member]            
Disclosure of contingent liabilities [line items]            
Amount contributed related party transactions   20,000 $ 651 $ 10,000 $ 0  
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       $ 97,624