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Seasonal Financing and Debt - Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt	$ 3,123,119	$ 2,134,271
Debt issuance costs and debt discount	(26,881)	(15,729)
Less: current portion	(250,000)	0
Long-term debt	2,873,119	2,134,271
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 2041
Debt Instrument [Line Items]
Long-term debt	300,000	300,000
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	350,000
2017 Senior Notes due December 2025
Debt Instrument [Line Items]
Long-term debt	$ 1,000,000	$ 0

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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