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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, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2024
USD ($)
Disclosure of contingent liabilities [line items]            
Unused letters of credit   $ 3,139,000   $ 134,000   $ 95,730
Committed to purchase property, plant and equipment   118,263,200   56,943,589   3,606,685
Prepayment of property, plant and equipment   5,890,890 $ 179,655 9,016,441    
Letter of credits   708,130   645,255   $ 21,596
Approved contribution in consideration of corporate social responsibility for environmental protection   100,000        
Amount contributed related party transactions   112,500 3,431 125,000 $ 120,000  
ASE Environmental Protection And Sustainability Foundation [Member]            
Disclosure of contingent liabilities [line items]            
Amount contributed related party transactions   100,000 3,050 100,000 100,000  
ASE Cultural and Educational Foundation [member]            
Disclosure of contingent liabilities [line items]            
Amount contributed related party transactions   12,500 381 $ 25,000 $ 20,000  
Amount contributed related party transactions   10,000 $ 305      
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