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Seasonal Financing and Debt - Long-Term Debt (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Gross, long-term debt | $ 2,900,000 | $ 3,150,000 |
Debt issuance costs and debt discount | (48,277) | (26,881) |
Long-term debt | 2,851,723 | 3,123,119 |
Less: current portion | 0 | (250,000) | $ (250,000)
Total long-term debt | 2,851,723 | 2,873,119 | $ 1,886,404
2010 Senior Notes due October 2020 and October 2040 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Gross, long-term debt | 500,000 | 500,000 |
2011 Senior Notes due November 2041 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Gross, long-term debt | 300,000 | 300,000 |
2013 Senior Notes due March 2018 and March 2023 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Gross, long-term debt | 250,000 | 500,000 |
2014 Senior Notes due May 2019 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Gross, long-term debt | 0 | 500,000 |
2016 Senior Notes due August 2021 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Gross, long-term debt | 350,000 | 350,000 |
2017/2018 Senior Notes due December 2025 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Gross, long-term debt | $ 1,500,000 | $ 1,000,000 |

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