Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Operating Leases
Right of use assets-operating leases	$ 367,477	$ 336,513
Operating lease liabilities	64,484	59,796
Operating lease liabilities noncurrent	304,624	278,303
Total operating lease liabilities	369,108	338,099
Finance Leases
Accumulated depreciation	(4,896,427)	(4,512,764)
Property, plant and equipment, net, Total	5,874,275	5,373,124
Current maturities of long-term debt	$ 2,740	$ 2,060
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	us-gaap:DebtCurrent	us-gaap:DebtCurrent
Long-term debt	$ 76,591	$ 50,845
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	us-gaap:LongTermDebtAndCapitalLeaseObligations	us-gaap:LongTermDebtAndCapitalLeaseObligations
Total finance lease liabilities	$ 79,331	$ 52,905
Weighted Average remaining lease term, years
Operating leases	9 years 1 month 6 days	10 years 10 months 24 days
Finance leases	20 years 9 months 18 days	8 years 1 month 6 days
Weighted Average discount rate
Operating leases	3.80%	4.40%
Finance leases	7.10%	9.70%
Finance Lease
Finance Leases
Property and equipment	$ 102,940	$ 75,611
Accumulated depreciation	(30,949)	(28,595)
Property, plant and equipment, net, Total	$ 71,991	$ 47,016