v3.25.1
Components of Net Periodic Benefit Cost (Narrative) (Detail)
 3 Months Ended
Dec. 31, 2006
Dec. 31, 2002
Mar. 31, 2025
USD ($)
number_of_plans
Retirement Benefits [Abstract]      
Defined benefit plan age attained for coverage | number_of_plans     21
Service period for employees of coverage age, years (at least)     1 year
Defined benefit plan, percentage vested     100.00%
Retiree benefits eliminated if less than service period, years (less than) 10 years 10 years  
Defined benefit plan, contributions by employer | $     $ 0