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Long-Term Debt (Parenthetical) (Detail) (USD $)	Jun. 30, 2013 9.875% Senior Notes due 2016	Dec. 31, 2012 9.875% Senior Notes due 2016	Jun. 30, 2013 8.0% Senior Notes due 2018	Dec. 31, 2012 8.0% Senior Notes due 2018	Jun. 30, 2013 8.75% Senior Notes due 2020	Dec. 31, 2012 8.75% Senior Notes due 2020	Jun. 30, 2013 7.5% Senior Notes due 2021	Dec. 31, 2012 7.5% Senior Notes due 2021	Jun. 30, 2013 8.125% Senior Notes due 2022	Dec. 31, 2012 8.125% Senior Notes due 2022	Jun. 30, 2013 7.5% Senior Notes due 2023	Dec. 31, 2012 7.5% Senior Notes due 2023	Jun. 30, 2013 Senior credit facility	Mar. 31, 2013 Senior credit facility	Aug. 31, 2012 Senior credit facility
Debt Instrument
Long-term debt, fixed interest rate	9.875%	9.875%	8.00%	8.00%	8.75%	8.75%	7.50%	7.50%	8.125%	8.125%	7.50%	7.50%
Debt maturity date	2016	2016	2018	2018	2020	2020	2021	2021	2022	2022	2023	2023	March 2017
Long term debt, discount	$ 0	$ 8,843,000			$ 5,575,000	$ 5,873,000					$ 3,893,000	$ 4,029,000
Long term debt, premium							4,128,000	4,328,000
Line of credit facility maximum borrowings capacity													$ 775,000,000	$ 775,000,000	$ 775,000,000

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Debt instrument, maturity date

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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