Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (11,780)	$ (12,321)
Long-term debt	710,615	712,255
Less current portion of long-term debt	8,544	9,522
Long-term debt due after one year, net	702,071	702,733
6.25% Senior Secured Notes Due 2028 [Member]
Debt Instrument [Line Items]
Debt carrying amount	700,000	700,000
8.32% Secured Financing Due 2023 [Member]
Debt Instrument [Line Items]
Debt carrying amount	3,292	4,161
8.75% Secured Financing Due 2025 [Member]
Debt Instrument [Line Items]
Debt carrying amount	18,023	19,277
Other [Member]
Debt Instrument [Line Items]
Debt carrying amount	$ 1,080	$ 1,138

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

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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.

+ References

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