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Fair Values of Financial Instruments - Estimated Fair Value of Outstanding Debt Balances (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt | $ 1,242,061 | $ 1,246,086
Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt | 1,242,680 | 1,223,284
3.95% Senior Notes Due 2028 | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt | 482,505 | 482,505
3.95% Senior Notes Due 2028 | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt | 459,274 | 450,540
5.15% Senior Notes Due 2029 | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt | 344,895 | 344,895
5.15% Senior Notes Due 2029 | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt | 337,487 | 329,032
7.15% Senior Notes due 2033 | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt | 400,000 | 400,000
7.15% Senior Notes due 2033 | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt | 430,206 | 424,946
Equipment Loans Due 2025 | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt | 14,661 | 18,686
Equipment Loans Due 2025 | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt | $ 15,713 | $ 18,766

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- Definition 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. + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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