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Seasonal Financing and Debt - Narrative (Detail) |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 20, 2017 USD ($) trading_day | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 20, 2018 USD ($) | May 31, 2018 USD ($) | Sep. 30, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Book value of assets pledged as collateral |  |  |  | $ 900,000,000 |  |  |  |
Foreign credit lines available |  |  |  | 20,000,000 |  |  |  |
Outstanding amounts of accounts receivable sold under international factoring arrangements |  |  | $ 19,000,000 | 0 | $ 19,000,000 |  |  |
Short term bank loans outstanding |  |  | 0 | 4,176,000 | 0 |  |  | $ 732,649,000
Credit Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  | 89,000,000 |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit |  |  | $ 0 | 0 | 0 |  |  |
Domestic Unsecured Committed Revolving Credit Facility And Other Short Term Borrowings |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Average borrowings |  |  |  | $ 126,200,000 | $ 811,500,000 |  |  |
Weighted average interest rate as of the balance sheet date |  |  | 1.60% | 3.90% | 1.60% |  |  |
2018 Senior Notes due December 2015 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal of debt instrument |  |  |  |  |  | $ 1,000,000,000.00 | $ 500,000,000.0 |
Interest rate range |  |  |  |  |  | 6.75% | 6.75% |
2013 Senior Notes due March 2018 and March 2023 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt |  | $ 250,000,000 |  |  |  |  |  |
Interest rate |  |  | 2.43% | 2.43% | 2.43% |  |  |
2013 Senior Notes due March 2018 and March 2023 | Minimum | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate range |  |  | 1.70% | 1.70% | 1.70% |  |  |
2013 Senior Notes due March 2018 and March 2023 | Maximum | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate range |  |  | 3.15% | 3.15% | 3.15% |  |  |
2017 Senior Notes due December 2025 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal of debt instrument |  |  | $ 1,000,000,000.0 |  | $ 1,000,000,000.0 |  |  |
Interest rate range |  |  | 6.75% |  | 6.75% |  |  |
2016 Senior Notes due August 2021 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate range |  |  | 2.35% | 2.35% | 2.35% |  |  |
2010 Senior Notes due October 2020 and October 2040 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  | 5.28% | 5.28% | 5.28% |  |  |
2010 Senior Notes due October 2020 and October 2040 | Minimum | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate range |  |  | 4.35% | 4.35% | 4.35% |  |  |
2010 Senior Notes due October 2020 and October 2040 | Maximum | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate range |  |  | 6.20% | 6.20% | 6.20% |  |  |
2011 Senior Notes due November 2041 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate range |  |  | 5.45% | 5.45% | 5.45% |  |  |
2014 Senior Notes due May 2019 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate range |  |  | 2.35% | 2.35% | 2.35% |  |  |
2017/2018 Senior Notes due December 2025 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate range |  |  |  | 6.75% |  |  |  |
Debt Instrument, Redemption, Period One | 2017 Senior Notes due December 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of principal amount of debt redeemed |  |  | 40.00% |  |  |  |  |
Redemption price option one |  |  | 106.75% |  |  |  |  |
Debt Instrument, Redemption, Period One | 2017 Senior Notes due December 2025 | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Redemption price call premium |  |  | 0.00% |  |  |  |  |
Debt Instrument, Redemption, Period One | 2017 Senior Notes due December 2025 | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Redemption price call premium |  |  | 5.063% |  |  |  |  |
Debt Instrument, Redemption, Period Two | 2017 Senior Notes due December 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of principal amount of debt redeemed |  |  | 100.00% |  |  |  |  |
Revolving Credit Facility | Credit Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate commitment under the credit facility | $ 1,600,000,000 |  |  |  |  |  |  |
Equity interest subject to a lien | 100.00% |  |  |  |  |  |  |
Voting stock subject to a lien | 65.00% |  |  |  |  |  |  |
Interest coverage ratio minimum for covenant compliance | 1.00 |  |  |  |  |  |  |
Excess availability under credit facility contingency (less than) | $ 100,000,000 |  |  |  |  |  |  |
Availability threshold contingency | 10.00% |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Consecutive Trading Days | trading_day | 30 |  |  |  |  |  |  |
Revolving Credit Facility | Credit Agreement | LIBOR | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate margin for loans | 1.25% |  |  |  |  |  |  |
Revolving Credit Facility | Credit Agreement | LIBOR | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate margin for loans | 3.00% |  |  |  |  |  |  |
Revolving Credit Facility | Credit Agreement | Base Rate | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate margin for loans | 0.25% |  |  |  |  |  |  |
Revolving Credit Facility | Credit Agreement | Base Rate | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate margin for loans | 2.00% |  |  |  |  |  |  |
Revolving Credit Facility, Asset Based | Credit Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate commitment under the credit facility | $ 1,310,000,000 |  |  |  |  |  |  |
Revolving Credit Facility, Secured | Credit Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate commitment under the credit facility | $ 294,000,000 |  |  |  |  |  |  |

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