Stockholders' Equity - Adjustments for Items Reclassified From AOCI (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Adjustment for items reclassified to earnings	$ 138	$ 51	$ 265	$ 23,630
Total reclassifications, net of tax	1,300	1,532	3,081	27,905
Employee Benefit Plans [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Amortization relating to employee benefit plans	1,395	1,903	3,564	5,561
Less - related income taxes	233	422	748	1,286
Total reclassifications, net of tax	$ 1,162	$ 1,481	$ 2,816	$ 4,275