Benefit Plans - Defined Benefit Pension Plan (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Retirement Benefits [Abstract]
Service cost – benefits earned during year	$ 357	$ 552	$ 1,061	$ 1,638
Interest cost on projected benefit obligation	1,589	1,037	4,715	3,076
Expected return on plan assets	$ (2,811)	$ (2,917)	$ (8,342)	$ (8,655)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Employee Benefits	Employee Benefits	Employee Benefits	Employee Benefits
Amortization of prior service cost	$ (9)	$ (9)	$ (27)	$ (26)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Employee Benefits	Employee Benefits	Employee Benefits	Employee Benefits
Amortization of net loss	$ 227	$ 128	$ 675	$ 379
Net periodic pension income	$ (647)	$ (1,209)	$ (1,918)	$ (3,588)