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Long-Term Debt - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |
Document Period End Date |  | Mar. 31, 2022 |
Long-term debt including current maturities |  | $ 618,600 | $ 568,800
Debt Instrument, Unused Borrowing Capacity, Amount |  | 250,000 |
Short-term borrowing |  | $ 140,865 | 221,634
Uncollateralized Senior Note Due December Two Thousand Thirty Four [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.98% |
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 |  | 70,000 | 70,000
Aggregated Unfunded Commitments [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt including current maturities |  | 0 |
Equipment Security Note |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt including current maturities |  | $ 9,165 | $ 9,378
Debt Instrument, Interest Rate, Stated Percentage |  | 2.46% |
Equipment Security Note | Marlin Gas Services [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt including current maturities |  | $ 9,600 |
Uncollateralized Senior Note Due March 15, 2042 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt including current maturities |  | $ 50,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.95% |
Aggregate Shelf Agreements [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt including current maturities |  | $ 270,000 |
MetLife [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes | [1] | 150,000 |
Long-term debt including current maturities | [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] |  |  |
Long-term debt including current maturities |  | 50,000 |
Prudential [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt including current maturities | [1] | 220,000 |
Debt Instrument, Unused Borrowing Capacity, Amount | [1] | 150,000 |
Maximum [Member] | Aggregate Shelf Agreements [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes |  | 520,000 |
Maximum [Member] | Prudential [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes | [1] | $ 370,000 |
[1] | (1) The Prudential and MetLife Shelf Agreements expire in April 2023 and May 2023, respectively.

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