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Employee Benefits - Schedule Of Main Actuarial Assumptions Of Defined Benefit Plans (Detail) - Defined benefit plans
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
ITALY    
Disclosure Of Detailed Information About Employee Benefits [Line Items]    
Discount rate   0.44%
Inflation rate   1.75%
Salary increase rate 2.55% 2.81%
ITALY | Top of range    
Disclosure Of Detailed Information About Employee Benefits [Line Items]    
Average duration of plan (years) 17 years 5 months 19 days 14 years 10 months 24 days
Discount rate 3.86%  
Inflation rate 4.53%  
ITALY | Bottom of range    
Disclosure Of Detailed Information About Employee Benefits [Line Items]    
Average duration of plan (years) 8 years 6 months 9 years 9 months 18 days
Discount rate 3.01%  
Inflation rate 2.59%  
AUSTRIA    
Disclosure Of Detailed Information About Employee Benefits [Line Items]    
Salary increase rate   2.30%
AUSTRIA | Top of range    
Disclosure Of Detailed Information About Employee Benefits [Line Items]    
Average duration of plan (years) 11 years 13 years 2 months 12 days
Discount rate 4.16% 1.23%
Salary increase rate 7.50%  
AUSTRIA | Bottom of range    
Disclosure Of Detailed Information About Employee Benefits [Line Items]    
Average duration of plan (years) 7 years 7 months 6 days 9 years 1 month 6 days
Discount rate 4.09% 0.99%
Salary increase rate 3.00%