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Long-term Debt - Long-term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Aug. 03, 2018
Debt Instrument [Line Items]
Principal	$ 2,769,400
Debt issuance costs, net of amortization	(34,403)	$ (25,693)
Long-term Debt	2,517,149	2,500,132
Bank credit facility
Debt Instrument [Line Items]
Principal	500,000	1,250,000
7½% Senior Notes Due 2025
Debt Instrument [Line Items]
Principal	619,400	625,000
Discount, net of amortization	(145,672)	(169,232)
9¾% Senior Notes Due 2026
Debt Instrument [Line Items]
Principal	1,650,000	850,000
Discount, net of amortization	$ (72,176)	$ (29,943)
Interest rate on debt instrument	9.00%		9.75%

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Long term debt principal amount.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Amount, after accumulated amortization, of debt discount.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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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