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Summary of Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Revolving credit facility	$ 190,000	$ 206,000
Total	1,265,000	1,281,000
7.25% Senior Unsecured Notes due 2019
Debt Instrument [Line Items]
Senior notes	300,000	300,000
8.5% Senior Notes due 2020
Debt Instrument [Line Items]
Senior notes	$ 775,000	$ 775,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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