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Significant Contingent Liabilities and Unrecognized Commitments - Additional Information (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Mar. 30, 1999
Dec. 31, 2021
Dec. 31, 2020
Letters of Credit [member]      
Disclosure of contingent liabilities [line items]      
Amounts available under unused letters of credit   $ 136.7 $ 56.2
Systems on Silicon Manufacturing Company Pte Ltd. [member]      
Disclosure of contingent liabilities [line items]      
Equity interest in joint venture 32.00% 39.00%  
Minimum collective purchase capacity required   70.00%  
Maximum purchase capacity required   28.00%  
NXP B.V [member] | Systems on Silicon Manufacturing Company Pte Ltd. [member]      
Disclosure of contingent liabilities [line items]      
Equity interest in joint venture   61.00%  
Technical Cooperation Agreement with Industrial Technology Research Institute [member]      
Disclosure of contingent liabilities [line items]      
Maximum capacity that can be used as per agreement   35.00%  
Term of agreement   5 years  
Renewal period of agreement   automatically renewed for successive periods of five years unless otherwise terminated by either party with one year prior notice.  
Notice period for contract termination   1 year