Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) - Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Amortization of pension and postretirement items:
Tax benefit	$ (16,586)	$ (11,615)
Derivative, Gain (Loss) on Derivative, Net	1,256	671
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan		100
Interest Rate Swap [Member] | Derivatives designated as hedging instrument [Member] | Interest Expense [Member]
Amortization of pension and postretirement items:
Derivative, Gain (Loss) on Derivative, Net	$ 172	$ 65