Long-Term Debt - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Long-term debt, interest percentage	6.54%
Debt Instrument, Unused Borrowing Capacity, Amount	$ 343,300
Long-term debt including current maturities	1,500,000	$ 1,300,000
Long-term Debt and Lease Obligation	1,461,700	1,287,200
Total long-term debt, net of current maturities	1,327,100	1,261,700
Unamortized Debt Issuance Expense	(3,600)	(3,600)
Long-term Debt and Lease Obligation, Current	$ (134,600)	(25,500)
Uncollateralized Senior Note Due On Two Thousand Twenty Six [Member]
Debt Instrument [Line Items]
Long-term debt, interest percentage	5.68%
Long-term debt including current maturities	$ 2,900	5,800
Uncollateralized Senior Note Due December Two Thousand Thirty Four [Member]
Debt Instrument [Line Items]
Long-term debt, interest percentage	2.98%
Long-term debt including current maturities	$ 63,000	50,000
Uncollateralized Senior Note Due On May 2 Two Thousand Twenty Eight [Member]
Debt Instrument [Line Items]
Long-term debt, interest percentage	6.43%
Long-term debt including current maturities	$ 2,100	2,800
Uncollateralized Senior Note Two Due on December Two Thousand Twenty Eight [Member]
Debt Instrument [Line Items]
Long-term debt, interest percentage	3.73%
Long-term debt including current maturities	$ 6,000	8,000
Uncollateralized Senior Notes Due On Two Thousand Twenty Nine [Member]
Debt Instrument [Line Items]
Long-term debt, interest percentage	3.88%
Long-term debt including current maturities	$ 20,000	25,000
Uncollateralized Senior Note Due April Two Thousand Thirty Two [Member]
Debt Instrument [Line Items]
Long-term debt, interest percentage	3.25%
Long-term debt including current maturities	$ 45,500	52,500
Uncollateralized Senior Note Due May Two Thousand Thirty Eight [Member]
Debt Instrument [Line Items]
Long-term debt, interest percentage	3.48%
Long-term debt including current maturities	$ 50,000	70,000
Uncollateralized Senior Note Due November Two Thousand Thirty Eight [Member]
Debt Instrument [Line Items]
Long-term debt, interest percentage	3.58%
Long-term debt including current maturities	$ 50,000	50,000
Uncollateralized Senior Note Due November Two Thousand Thirty Nine
Debt Instrument [Line Items]
Long-term debt including current maturities	$ 100,000	40,000
Uncollateralized Senior Note Due July Two Thousand Thirty Five
Debt Instrument [Line Items]
Long-term debt, interest percentage	3.00%
Long-term debt including current maturities	$ 50,000	50,000
Uncollateralized Senior Note Due August Two Thousand Thirty Five
Debt Instrument [Line Items]
Long-term debt, interest percentage	2.96%
Long-term debt including current maturities	$ 40,000	100,000
Uncollateralized Senior Note Due January Two Thousand Thirty Seven
Debt Instrument [Line Items]
Long-term debt, interest percentage	2.49%
Long-term debt including current maturities	$ 50,000	50,000
Equipment Security Note
Debt Instrument [Line Items]
Long-term debt, interest percentage	2.46%
Long-term debt including current maturities	$ 5,800	6,700
Uncollateralized Senior Note Due March 15, 2042
Debt Instrument [Line Items]
Long-term debt, interest percentage	2.95%
Long-term debt including current maturities	$ 50,000	$ 50,000
Uncollateralized Senior Note Due October 2029
Debt Instrument [Line Items]
Long-term debt, interest percentage	5.20%
Uncollateralized Senior Note Due October 2029 | Prudential [Member]
Debt Instrument [Line Items]
Long-term debt including current maturities	$ 100,000
Uncollateralized Senior Notes Aggregate
Debt Instrument [Line Items]
Long-term debt, interest percentage	5.04%
Uncollateralized Senior Notes Aggregate | Prudential [Member]
Debt Instrument [Line Items]
Long-term debt including current maturities	$ 200,000
Uncollateralized Senior Notes Issued August 2025 | Prudential [Member]
Debt Instrument [Line Items]
Long-term debt including current maturities	$ 150,000
Uncollateralized Senior Note Due September 2030
Debt Instrument [Line Items]
Long-term debt, interest percentage	5.02%
Long-term debt including current maturities	$ 50,000
Uncollateralized Senior Note Due September 2030 | Prudential [Member]
Debt Instrument [Line Items]
Long-term debt including current maturities	$ 50,000
Uncollateralized Senior Note Due August 2028
Debt Instrument [Line Items]
Long-term debt, interest percentage	4.88%
Long-term debt including current maturities	$ 60,000
Uncollateralized Senior Note Due August 2028 | Prudential [Member]
Debt Instrument [Line Items]
Long-term debt including current maturities	$ 60,000
Uncollateralized Senior Note Due August 2031
Debt Instrument [Line Items]
Long-term debt, interest percentage	5.16%
Long-term debt including current maturities	$ 90,000
Uncollateralized Senior Note Due August 2031 | Prudential [Member]
Debt Instrument [Line Items]
Long-term debt including current maturities	$ 90,000