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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Long-term Debt - Long-term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Jun. 28, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt, gross	$ 2,694,400
Long-term debt	2,615,235			$ 2,517,149
7.5% Senior Notes due 2025
Debt Instrument [Line Items]
Long-term debt, gross	244,400			619,400
Discount, net of amortization	(47,402)			(145,672)
Interest rate on debt instrument			7.50%
9.75% Senior Notes Due 2026
Debt Instrument [Line Items]
Long-term debt, gross	0			1,650,000
Discount, net of amortization	0			(72,176)
Interest rate on debt instrument			9.75%
6.75% Senior Notes Due 2029
Debt Instrument [Line Items]
Long-term debt, gross	1,250,000			0
Premium, net of amortization	6,874			0
Interest rate on debt instrument			6.75%
5.875% Senior Notes Due 2030
Debt Instrument [Line Items]
Long-term debt, gross	965,000			0
Interest rate on debt instrument		5.875%
Bank credit facility
Debt Instrument [Line Items]
Long-term debt, gross	235,000			500,000
Debt issuance costs, net of amortization	$ (38,637)			$ (34,403)