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Long-Term Debt (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total debt | $ 3,209,698 | $ 3,027,203 | $ 1,722,540
Less: Current maturities of long-term debt and short-term facilities | (380,041) | (299,909) | (80,038)
Long-term debt | 2,829,657 | 2,727,294 | 1,642,502
Revolving Facility, Due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | 100,000 |  |
6.60% Senior Notes, Due 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt |  | 299,871 | 299,774
7% Debentures, Due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | 124,249 | 124,180 | 124,157
6.25% Senior Notes, Due 2037 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | 228,079 | 228,033 | 228,018
4.25% Senior Notes, Due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | 396,251 | 395,814 | 395,673
4.250% Senior Notes, Due 2047 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | 591,499 | 591,688 |
3.500% Senior Notes, Due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | 494,643 | 494,352 |
Floating Rate Notes, Due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | 298,773 | 298,227 | 298,046
3.450% Senior Notes, Due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | 296,861 | 296,628 | 296,551
Floating Rate Notes, Due 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | 299,074 | 298,102 |
Trade Receivable Facility |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | 380,000 |  | 80,000
Other Notes |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 269 | $ 308 | $ 321

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