Employee Benefit Plans - Components of Net Periodic Benefit Cost (Credit) (Detail) - Pension Plans [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Components of Net Periodic Benefit Cost (Credit):
Service cost	$ 116	$ 212	$ 386	$ 669
Interest cost	2,642	2,123	8,459	6,379
Expected return on plan assets	(5,808)	(6,507)	(18,627)	(19,638)
Amortization of:
Prior service cost	25	29	80	89
Net actuarial loss (gain)	1,370	1,874	3,484	5,472
Settlement loss	380	378	1,223	1,142
Net periodic benefit cost (credit)	$ (1,275)	$ (1,891)	$ (4,995)	$ (5,887)