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Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Less: Amounts due within one year	$ 0	$ 14,711
Long-Term Debt, gross	875,000	817,448
Less: Deferred debt issuance costs	12,269	8,006	$ 9,583	$ 4,202
Long-Term Debt	862,731	809,442
Senior Notes | Secured Debt
Debt Instrument [Line Items]
Long-term debt including current maturities	800,000	400,000
Credit Facility | Secured Debt
Debt Instrument [Line Items]
Long-term debt including current maturities	$ 75,000	$ 432,159

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- Definition

Long-Term Debt, Gross, Current

+ References

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- Definition

Long-Term Debt, Gross, Excluding Current Maturities

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- Definition

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.

+ References

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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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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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