Pension and Employee Benefit Plans - Components of Pension and Employee Benefit Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (gain)	$ 107	$ (105)	$ 214	$ (210)
Health Care Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	318	220	637	439
Expected return on plan assets	(285)	(390)	(571)	(780)
Amortization of net actuarial loss	$ 74	$ 65	$ 148	$ 131