Benefit Plans - Defined Benefit Pension Plan (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Retirement Benefits [Abstract]
Service cost – benefits earned during year	$ 546	$ 623	$ 1,086	$ 1,239
Interest cost on projected benefit obligation	1,026	852	2,039	1,694
Expected return on plan assets	(2,885)	(2,794)	(5,738)	(5,557)
Amortization of prior service cost	(9)	(9)	(17)	(17)
Amortization of net loss	126	682	251	1,357
Net periodic pension income	$ (1,196)	$ (646)	$ (2,379)	$ (1,284)