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Indebtedness - Debt Outstanding (Parenthetical) (Detail) | Dec. 31, 2017 | Oct. 05, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Sep. 16, 2016 | May 31, 2015
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4.875% Senior Notes Due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on notes | 4.875% |  | 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% |
5.00% Senior Notes Due 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on notes | 5.00% | 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% | 5.75% |
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% |
5.00% Senior Subordinated Notes Due 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on notes | 5.00% |  | 5.00% |  | 5.00% |
5.75% Senior Subordinated Notes Due 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on notes | 5.75% |  | 5.75% |  | 5.75% |
Other Senior Notes Due 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on notes |  |  | 5.875% |  |  |
Notes Payable to Banks | 3.0% Bank Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Bank debt percentage |  |  | 3.00% |  |  |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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