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%

Debt instrument redemption price percentage of principal amount, accrued and unpaid interest redeemed.

No definition available.

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- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The cash inflow from a borrowing supported by a written promise to pay an obligation.

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-Glossary Financing Activities

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- Definition

Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

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