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Pension Plans and Postretirement Benefits - Additional Information (Detail)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
retiree
Dec. 31, 2021
USD ($)
retiree
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Service cost   $ 12,400 $ 11,300 $ 9,700
Other components of net periodic benefit cost   (92,900) $ (31,600) (17,500)
Pension settlement related charges $ 38,300      
Company contributions   6,164    
Other comprehensive loss as components of net periodic benefit cost for pension benefit in the current fiscal year   $ 3,100    
Percentage of investment return on domestic plan assets   9.00% 19.00%  
Liability for group annuity contract $ 45,600 $ 45,600    
Vesting period for employer matching contributions   3 years    
Other comprehensive income as components of net periodic benefit cost for other benefit in the current fiscal year   $ (200)    
Number of retirees transferred to annuity contract | retiree 400 400    
Pension settlement charges   $ 1,100    
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   $ 37,500 $ 35,800 31,700
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost   11,667 10,650 $ 9,123
Increase in pension plan benefit obligation   (43,000) 124,200  
Pension settlement related charges   $ 38,330 7,041  
Company contributions     $ 5,131  
Expected return on plan assets   6.80% 6.95% 6.95%