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Indebtedness - Debt Outstanding (Parenthetical) (Detail) | Jun. 30, 2015 | May. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Notes Payable to Banks | 1.5% Bank Debt |  |  |
Debt Instrument [Line Items] |  |  |
Bank debt percentage | 1.50% |  | 1.50%
Senior Notes | 4.875% Senior Notes Due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate on notes | 4.875% | 4.875% | 4.875%
Senior Subordinated Notes | 4.875% Senior Notes Due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate on notes | 4.875% |  | 4.875%
Senior Subordinated Notes | 6.75% Senior Subordinated Notes Due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate on notes | 6.75% | 6.75% | 6.75%
Senior Subordinated Notes | 5.75% Senior Subordinated Notes Due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate on notes | 5.75% |  | 5.75%
Senior Subordinated Notes | 5.00% Senior Subordinated Notes Due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate on notes | 5.00% |  | 5.00%
Senior Subordinated Notes | 5.00% Senior Subordinated Notes Due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate on notes | 5.00% |  | 5.00%

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