Benefit Plans - Defined Benefit Pension Plan (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Retirement Benefits [Abstract]
Service cost – benefits earned during year	$ 330	$ 354	$ 660	$ 704
Interest cost on projected benefit obligation	1,603	1,572	3,206	3,126
Expected return on plan assets	$ (2,599)	$ (2,781)	$ (5,198)	$ (5,531)
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	$ (8)	$ (9)	$ (17)	$ (18)
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	$ 21	$ 225	$ 42	$ 448
Net periodic pension income	$ (653)	$ (639)	$ (1,307)	$ (1,271)