v3.25.4
Pension Plans and Postretirement Benefits - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Service term requirement 3 months    
Service cost $ 15,100 $ 7,900 $ 7,900
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Income (Expense) Other Income (Expense) Other Income (Expense)
Net periodic defined benefits expense (reversal), excluding service cost $ (15,200) $ (800) $ 20,900
Other comprehensive (income) loss, net periodic benefit cost 3,200    
Other comprehensive (income) loss, pension benefits and other benefits $ 100    
Percentage of investment return on domestic plan assets 10.00% 0.00%  
Vesting period for employer matching contributions 3 years    
Thrift Plan      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of matching contribution by employer 50.00%    
Thrift Plan | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Employer matching percentage 6.00%    
Thrift Plan and MII Thrift Plan      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 43,000 $ 47,400 41,500
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 13,156 7,523 $ 7,515
Increase in pension plan benefit obligation $ 13,800 $ (49,000)