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Seasonal Financing and Debt - Long-Term Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term debt $ 2,134,271 $ 2,084,721
Debt issuance costs (15,729) (15,279)
Less: current portion 0 (300,000)
Long-term debt 2,134,271 1,784,721
2010 Senior Notes due October 2020 and October 2040    
Debt Instrument [Line Items]    
Long-term debt 500,000 500,000
2011 Senior Notes due November 2016 and November 2041    
Debt Instrument [Line Items]    
Long-term debt 300,000 600,000
2013 Senior Notes due March 2018 and March 2023    
Debt Instrument [Line Items]    
Long-term debt 500,000 500,000
2014 Senior Notes due May 2019    
Debt Instrument [Line Items]    
Long-term debt 500,000 500,000
2016 Senior Notes due August 2021    
Debt Instrument [Line Items]    
Long-term debt $ 350,000 $ 0