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v3.25.3

Long-Term Debt - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Debt Instrument [Line Items] |  |
Document Period End Date | Sep. 30, 2025 |
Long-term debt including current maturities | $ 1,500,000 | $ 1,300,000
Debt Instrument, Unused Borrowing Capacity, Amount | 305,000 |
Short-term borrowing | $ 95,800 | 196,500
Uncollateralized Senior Note Due December Two Thousand Thirty Four [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.98% |
Debt instrument, maturity date | Dec. 20, 2034 |
Term Note Due January Two Thousand Twenty [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt including current maturities | $ 70,000 | 70,000
3.48% note, due May 31, 2038 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt including current maturities | 50,000 | 50,000
3.25% note, due April 30, 2032 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt including current maturities | 47,300 | 52,500
Equipment Security Note |  |
Debt Instrument [Line Items] |  |
Long-term debt including current maturities | $ 6,000 | 6,700
Debt Instrument, Interest Rate, Stated Percentage | 2.46% |
Debt instrument, maturity date | Sep. 24, 2031 |
Uncollateralized Senior Note Due March 15, 2042 |  |
Debt Instrument [Line Items] |  |
Long-term debt including current maturities | $ 50,000 | 50,000
Debt Instrument, Interest Rate, Stated Percentage | 2.95% |
Debt instrument, maturity date | Mar. 15, 2042 |
Uncollateralized Senior Note Due March 14, 2038 |  |
Debt Instrument [Line Items] |  |
Long-term debt including current maturities | $ 80,000 |
Debt Instrument, Interest Rate, Stated Percentage | 5.43% |
Debt instrument, maturity date | Mar. 14, 2038 |
Uncollateralized Senior Note Due January Two Thousand Thirty Seven |  |
Debt Instrument [Line Items] |  |
Long-term debt including current maturities | $ 50,000 | $ 50,000
Debt Instrument, Interest Rate, Stated Percentage | 2.49% |
Debt instrument, maturity date | Jan. 25, 2037 |
Uncollateralized Senior Note Due October 2029 |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.20% |
Uncollateralized Senior Note Due MM YYYY |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.04% |
Uncollateralized Senior Note Due September 2030 |  |
Debt Instrument [Line Items] |  |
Long-term debt including current maturities | $ 50,000 |
Debt Instrument, Interest Rate, Stated Percentage | 5.02% |
Debt instrument, maturity date | Sep. 01, 2030 |
Uncollateralized Senior Note Due August 2028 |  |
Debt Instrument [Line Items] |  |
Long-term debt including current maturities | $ 60,000 |
Debt Instrument, Interest Rate, Stated Percentage | 4.88% |
Debt instrument, maturity date | Aug. 01, 2028 |
Uncollateralized Senior Note Due August 2031 |  |
Debt Instrument [Line Items] |  |
Long-term debt including current maturities | $ 90,000 |
Debt Instrument, Interest Rate, Stated Percentage | 5.16% |
Debt instrument, maturity date | Aug. 01, 2031 |
Prudential [Member] | Uncollateralized Senior Note Due October 2029 |  |
Debt Instrument [Line Items] |  |
Long-term debt including current maturities | $ 100,000 |
Prudential [Member] | Uncollateralized Senior Note Due MM YYYY |  |
Debt Instrument [Line Items] |  |
Long-term debt including current maturities | 200,000 |
Prudential [Member] | Uncollateralized Senior Notes Issued August 2025 |  |
Debt Instrument [Line Items] |  |
Long-term debt including current maturities | 150,000 |
Prudential [Member] | Uncollateralized Senior Note Due September 2030 |  |
Debt Instrument [Line Items] |  |
Long-term debt including current maturities | 50,000 |
Prudential [Member] | Uncollateralized Senior Note Due August 2028 |  |
Debt Instrument [Line Items] |  |
Long-term debt including current maturities | 60,000 |
Prudential [Member] | Uncollateralized Senior Note Due August 2031 |  |
Debt Instrument [Line Items] |  |
Long-term debt including current maturities | $ 90,000 |

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