Quarterly report pursuant to Section 13 or 15(d)

Employee Benefit Plans - Components of Postretirement Benefit Cost and Pension Cost (Detail)

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Employee Benefit Plans - Components of Postretirement Benefit Cost and Pension Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Pension Plans, Defined Benefit [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 83 $ 93
Interest cost 308 300
Expected return on assets (542) (682)
Amortization of actuarial loss 165 213
Net pension cost and postretirement benefit cost 14 (76)
Other Postretirement Benefit Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 4 3
Amortization of actuarial loss 3 6
Net pension cost and postretirement benefit cost $ 7 $ 9