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Indebtedness - Senior Notes - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
May. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014
4.875% Senior Notes Due 2025 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount | $ 750,000 | $ 750,000 |
Interest rate on notes | 4.875% | 4.875% | 4.875%
Net proceeds after underwriting discounts and commissions | $ 737,800 |  |
Underwriting discounts and commissions | $ 12,200 |  |
Debt instrument redemption, percentage of principal amount | 100.00% |  |
4.875% Senior Notes Due 2025 | Senior Subordinated Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate on notes |  | 4.875% | 4.875%
6.75% Senior Subordinated Notes Due 2020 | Senior Subordinated Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate on notes | 6.75% | 6.75% | 6.75%

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