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Decreased Libor Floor Rate

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Minimum alternate base rate.

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Term loan senior secured leverage ratio.

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Write-off of capitalized call premium.

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Face (par) amount of debt instrument at time of issuance.

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Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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-Name Accounting Standards Codification
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Weighted average interest rate of debt outstanding.

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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 Obligations - Term Loan Credit Agreement - Additional Information (Detail) $ in Thousands	1 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($)	Aug. 31, 2018 USD ($)	Dec. 31, 2020 USD ($) OptionPlan	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Aggregate principal amount			$ 1,194,737
Finance lease obligations			$ 13,983		$ 14,990
Banker and legal fees				$ 856
LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument interest rate increase decrease			2.50%
Debt instrument weighted average interest rate			3.25%
Alternate Base Interest Rate Loans [Member]
Debt Instrument [Line Items]
Debt instrument interest rate increase decrease			1.50%
Other Expense [Member]
Debt Instrument [Line Items]
Write off of deferred financing costs				186
Write off of capitalized original issue discount				102
Write off of capitalized call premium				58
Banker and legal fees				$ 800
Maximum [Member]
Debt Instrument [Line Items]
Senior secured leverage ratio			3.2
Minimum [Member]
Debt Instrument [Line Items]
Senior secured leverage ratio			1.0
6.625% Senior Notes due 2026 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount		$ 500,000
Notes issued rate		6.625%	6.625%
Debt instrument maturity date		Aug. 31, 2026	Aug. 01, 2026
Debt costs capitalized		$ 6,230
Debt cost incurred		$ 2,270
6.625% Senior Notes due 2026 [Member] \| Senior Notes [Member] \| New Mexico facility [Member]
Debt Instrument [Line Items]
Finance lease obligations	$ 11,990
6.125% Senior Notes due 2023 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Notes issued rate			6.125%
Debt instrument maturity date		Aug. 31, 2023	Aug. 15, 2023
Write off of deferred financing costs		$ 29
Debt costs capitalized		986
6.125% Senior Notes due 2023 [Member] \| Senior Notes [Member] \| Loans and Notes Payable [Member]
Debt Instrument [Line Items]
Debt repayments		90,000
Term Loan Credit Agreement [Member]
Debt Instrument [Line Items]
Percentage of net cash proceeds above sale of assets subject to debt mandatory prepayment			100.00%
Percentage of net cash proceeds of incurrence of debt subject to debt mandatory prepayment			100.00%
Percentage excess cash flow debt mandatory prepayment subject to leverage ratio			50.00%
Reduction in percentage of excess cash flow debt mandatory prepayment subject to leverage ratio			25.00%
Leverage ratio below that zero percentage of Excess Cash Flow as defined in the New Term Loan Credit Agreement			2.50
Repayment of Term debt Loan	$ 62,770
Term Loan Credit Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Senior secured leverage ratio			3.50
Term Loan Credit Agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Reduction in percentage of excess cash flow debt mandatory prepayment subject to leverage ratio			0.00%
Senior secured leverage ratio			1.00
Term Loan Credit Agreement [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Debt repayments		400,000
Credit facility maturity date			Aug. 19, 2022
Term loans repayment, quarterly installment percentage			0.25%
Deferred financing costs and original issuance discount		1,824
Term Loan Credit Agreement [Member] \| Secured Debt [Member] \| Alternate Base Interest Rate Loans [Member]
Debt Instrument [Line Items]
Interest rate description			(i) an ABR for any day, a rate per annum equal to the greater of (a) the prime rate in effect on such day, (b) the federal funds effective rate in effect on such day plus 0.5%, (c) the adjusted LIBOR rate plus 1% and (d) 1.75% or (ii) the LIBOR rate, with a LIBOR floor of 0.75%, in each case plus an applicable margin.
Term Loan Credit Agreement [Member] \| Secured Debt [Member] \| LIBOR Based Loans [Member]
Debt Instrument [Line Items]
Interest rate description			(ii) the LIBOR rate, with a LIBOR floor of 0.75%, in each case plus an applicable margin
Term Loan Credit Agreement [Member] \| Secured Debt [Member] \| Other Expense [Member]
Debt Instrument [Line Items]
Write off of deferred financing costs		$ 968
Term Loan Credit Agreement [Member] \| Secured Debt [Member] \| Maximum [Member] \| Alternate Base Interest Rate Loans [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.75%
Term Loan Credit Agreement [Member] \| Secured Debt [Member] \| Maximum [Member] \| LIBOR Based Loans [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			2.75%
Term Loan Credit Agreement [Member] \| Secured Debt [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Number of pricing options \| OptionPlan			2
Minimum adjustment rate of LIBOR			1.75%
Decreased LIBOR floor rate			0.75%
Term Loan Credit Agreement [Member] \| Secured Debt [Member] \| Minimum [Member] \| Federal Funds Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			0.50%
Term Loan Credit Agreement [Member] \| Secured Debt [Member] \| Minimum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%