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Estimated Fair Values Determined Using Available Market Information and Valuation Methodologies (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Revolving Credit Facility
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt Instrument, Carrying Amount	$ 216,200
5.875 Percent Senior Notes due April 2021
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt Instrument, Carrying Amount	350,000	350,000
6.125 Percent Senior Notes due July 2022
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt Instrument, Carrying Amount	750,000	750,000
4.875 Percent Senior Notes due May 2023
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt Instrument, Carrying Amount	1,400,000	1,400,000
Level 2 \| Revolving Credit Facility
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, Fair Value	216,200
Level 2 \| 5.875 Percent Senior Notes due April 2021
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, Fair Value	352,408	370,125
Level 2 \| 6.125 Percent Senior Notes due July 2022
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, Fair Value	762,660	810,000
Level 2 \| 4.875 Percent Senior Notes due May 2023
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, Fair Value	$ 1,309,000	$ 1,428,882

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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