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v3.10.0.1

Indebtedness - Debt Outstanding (Parenthetical) (Detail) | Dec. 31, 2018 | Dec. 31, 2017 | Oct. 05, 2017 | Sep. 30, 2016
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4.875% Senior Notes Due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 4.875% | 4.875% |  |
5.00% Senior Notes Due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 5.00% | 5.00% | 5.00% | 5.00%
5.00% Senior Notes Due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 5.00% | 5.00% | 5.00% | 5.00%
5.75% Senior Notes Due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 5.75% | 5.75% | 5.75% | 5.75%
5.875% Senior Notes Due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 5.875% | 5.875% | 5.875% |
5.00% Senior Subordinated Notes Due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 5.00% | 5.00% |  |
5.00% Senior Subordinated Notes Due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 5.00% | 5.00% |  |
5.75% Senior Subordinated Notes Due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 5.75% | 5.75% |  |
Other Senior Notes Due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 5.875% | 5.875% |  |
Notes Payable to Banks | 4.1% Bank Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Bank debt percentage | 4.10% | 4.10% |  |

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