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Long-Term Debt - Long-Term Debt (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Total debt | $ 2,922,859 | $ 3,120,481
Less: Current maturities of long-term debt and short-term facilities | (190,044) | (390,042)
Long-term debt | 2,732,815 | 2,730,439
4.25% Senior Notes, Due 2024 |  |
Debt Instrument [Line Items] |  |
Total debt | 396,849 | 396,398
7% Debentures, Due 2025 |  |
Debt Instrument [Line Items] |  |
Total debt | 124,343 | 124,272
3.450% Senior Notes, Due 2027 |  |
Debt Instrument [Line Items] |  |
Total debt | 297,178 | 296,939
3.500% Senior Notes, Due 2027 |  |
Debt Instrument [Line Items] |  |
Total debt | 495,136 | 494,765
6.25% Senior Notes, Due 2037 |  |
Debt Instrument [Line Items] |  |
Total debt | 228,142 | 228,094
4.250% Senior Notes, Due 2047 |  |
Debt Instrument [Line Items] |  |
Total debt | 591,669 | 591,541
Floating Rate Senior Notes, Due 2019 |  |
Debt Instrument [Line Items] |  |
Total debt | 299,820 | 299,260
Floating Rate Senior Notes, Due 2020 |  |
Debt Instrument [Line Items] |  |
Total debt | 299,508 | 298,956
Other Notes |  |
Debt Instrument [Line Items] |  |
Total debt | 214 | 256
Trade Receivable Facility |  |
Debt Instrument [Line Items] |  |
Total debt | $ 190,000 | $ 390,000

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