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v3.22.1

Long-Term Debt - Outstanding Long-Term Debt (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | $ (618,600) | $ (568,800)
Debt Instrument, Unused Borrowing Capacity, Amount |  | 250,000 |
Total Long-term debt |  | 617,595 | 567,865
Less: current maturities |  | (19,717) | (17,962)
Less: debt issuance costs |  | 970 | 913
Total long-term debt, net of current maturities |  | 597,878 | 549,903
Aggregated Unfunded Commitments [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | 0 |
5.93% note, due October 31, 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | $ (6,000) | (6,000)
Debt Instrument, Interest Rate, Stated Percentage |  | 5.93% |
5.68% note, due June 30, 2026 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | $ (14,500) | (14,500)
Debt Instrument, Interest Rate, Stated Percentage |  | 5.68% |
6.43% note, due May 2, 2028 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | $ (4,900) | (4,900)
Debt Instrument, Interest Rate, Stated Percentage |  | 6.43% |
3.73% note, due December 16, 2028 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | $ (14,000) | (14,000)
Debt Instrument, Interest Rate, Stated Percentage |  | 3.73% |
3.88% note, due May 15, 2029 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | $ (40,000) | (40,000)
Debt Instrument, Interest Rate, Stated Percentage |  | 3.88% |
3.25% note, due April 30, 2032 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | $ (70,000) | (70,000)
3.48% note, due May 31, 2038 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | (50,000) | (50,000)
Uncollateralized Senior Note Due November Two Thousand Thirty Eight [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | $ (50,000) | (50,000)
Debt Instrument, Interest Rate, Stated Percentage |  | 3.58% |
Uncollateralized Senior Note Due July Two Thousand Thirty Five |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | $ (50,000) | (50,000)
Debt Instrument, Interest Rate, Stated Percentage |  | 3.00% |
Uncollateralized Senior Note Due August Two Thousand Thirty Five |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | $ (40,000) | (40,000)
Debt Instrument, Interest Rate, Stated Percentage |  | 2.96% |
Uncollateralized Senior Note Due November Two Thousand Thirty Nine |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | $ (100,000) | (100,000)
Equipment Security Note |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | $ (9,165) | (9,378)
Debt Instrument, Interest Rate, Stated Percentage |  | 2.46% |
Equipment Security Note | Marlin Gas Services [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | $ (9,600) |
Uncollateralized Senior Note Due January Two Thousand Thirty Seven |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | $ (50,000) | $ (50,000)
Debt Instrument, Interest Rate, Stated Percentage |  | 2.49% |
Uncollateralized Senior Note Due March 15, 2042 |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | $ (50,000) |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.95% |
Aggregate Shelf Agreements [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | $ (270,000) |
Aggregate Shelf Agreements [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount |  | 520,000 |
Prudential [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | [1] | (220,000) |
Debt Instrument, Unused Borrowing Capacity, Amount | [1] | 150,000 |
Prudential [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | [1] | 370,000 |
MetLife [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | [1] | 150,000 |
Total long-term debt | [1] | (50,000) |
Debt Instrument, Unused Borrowing Capacity, Amount | [1] | 100,000 |
MetLife [Member] | Uncollateralized Senior Note Due March 15, 2042 |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt |  | $ (50,000) |
[1] | (1) The Prudential and MetLife Shelf Agreements expire in April 2023 and May 2023, respectively.

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