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Fair Value Measurements - Carrying Amounts and Fair Values of Financial Instruments (Parenthetical) (Detail) | Sep. 30, 2018 | Dec. 31, 2017 | Oct. 05, 2017 | Sep. 30, 2016
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5.75% Senior Notes Due 2021 |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Interest rate on notes | 5.75% | 5.75% | 5.75% | 5.75%
5.00% Senior Notes Due 2022 |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Interest rate on notes | 5.00% | 5.00% | 5.00% | 5.00%
5.875% Senior Notes Due 2022 |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Interest rate on notes | 5.875% | 5.875% | 5.875% |
5.00% Senior Notes Due 2023 |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Interest rate on notes | 5.00% | 5.00% | 5.00% | 5.00%
4.875% Senior Notes Due 2025 |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Interest rate on notes | 4.875% | 4.875% |  |
5.75% Senior Subordinated Notes Due 2021 |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Interest rate on notes | 5.75% | 5.75% |  |
5.00% Senior Subordinated Notes Due 2022 |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Interest rate on notes | 5.00% | 5.00% |  |
5.00% Senior Subordinated Notes Due 2023 |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Interest rate on notes | 5.00% | 5.00% |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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