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Long-Term Debt - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended																		6 Months Ended			1 Months Ended				1 Months Ended				0 Months Ended		1 Months Ended		3 Months Ended	6 Months Ended		0 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Senior credit facility	Jun. 30, 2013 Senior credit facility	Mar. 31, 2013 Senior credit facility	Aug. 31, 2012 Senior credit facility	Jun. 30, 2013 Senior credit facility Minimum	Jun. 30, 2013 Senior credit facility Maximum	Jun. 30, 2013 Senior credit facility Addition to LIBOR per annum Minimum	Jun. 30, 2013 Senior credit facility Addition to LIBOR per annum Maximum	Jun. 30, 2013 Senior credit facility Addition to federal funds rate	Jun. 30, 2013 Senior credit facility Addition to Eurodollar rate per annum	Jun. 30, 2013 Senior credit facility Applicable margin to base rate per annum Minimum	Jun. 30, 2013 Senior credit facility Applicable margin to base rate per annum Maximum	Aug. 31, 2012 Senior credit facility Prior to additional debt issuance	Jun. 30, 2013 9.875% Senior Notes due 2016	Mar. 31, 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	Mar. 31, 2013 8.0% Senior Notes due 2018	Dec. 31, 2012 8.0% Senior Notes due 2018	Jun. 30, 2013 9.875% Senior Notes and 8.0% Senior Notes	Jun. 30, 2013 7.5% Senior Notes due 2023	Dec. 31, 2012 7.5% Senior Notes due 2023	Aug. 31, 2012 7.5% Senior Notes due 2023 2012 Activity	Jun. 30, 2013 7.5% Senior Notes due 2023 2012 Activity	Jun. 30, 2013 7.5% Senior Notes due 2021	Dec. 31, 2012 7.5% Senior Notes due 2021	Aug. 31, 2012 7.5% Senior Notes due 2021 2012 Activity	Jun. 30, 2013 7.5% Senior Notes due 2021 2012 Activity	Jun. 30, 2013 8.125% Senior Notes due 2022	Dec. 31, 2012 8.125% Senior Notes due 2022	Apr. 17, 2012 8.125% Senior Notes due 2022 2012 Activity	Jun. 30, 2013 8.125% Senior Notes due 2022 2012 Activity	Aug. 31, 2012 2012 Senior Notes 2012 Activity	Jun. 30, 2013 2012 Senior Notes 2012 Activity	Jun. 30, 2013 Senior Notes	Jun. 30, 2013 Senior Notes	Aug. 06, 2012 Senior Floating Rate Notes due 2014	Sep. 04, 2012 Senior Floating Rate Notes due 2014 Tendered after August 17, 2012	Aug. 31, 2012 Senior Floating Rate Notes due 2014 Tendered by August 17, 2012
Debt Instrument
Long-term debt, debt to EBITDA, ratio maximum										4.5
Current assets to current liabilities, ratio minimum									1.0
Long-term debt, debt to EBITDA ratio, total funded debt determination					$ 10,000,000	$ 10,000,000
Debt maturity date					March 2017	March 2017												2016		2016	2018		2018		2023	2023			2021	2021			2022	2022
Line of credit facility, financial covenants compliance					As of and during the three and six-month periods ended June 30, 2013, the Company was in compliance with all applicable financial covenants under the senior credit facility.	As of and during the three and six-month periods ended June 30, 2013, the Company was in compliance with all applicable financial covenants under the senior credit facility.
Line of credit facility, guarantee						The obligations under the senior credit facility are guaranteed by certain Company subsidiaries and are secured by first priority liens on all shares of capital stock of certain of the Company’s material present and future subsidiaries; certain intercompany debt of the Company; and substantially all of the Company’s assets, including proved oil and natural gas reserves representing at least 80.0% of the discounted present value (as defined in the senior credit facility) of proved oil and natural gas reserves considered by the lenders in determining the borrowing base for the senior credit facility.
Line of credit facility, minimum collateral amount of proved oil and gas reserves representing the discounted present value of reserves used in borrowing base determination					80.00%	80.00%
Line of credit facility, basis spread on variable rate											1.75%	2.75%	0.50%	1.00%	0.75%	1.75%																									3.625%
Line of credit facility, interest rate determination reference						(a) LIBOR plus an applicable margin between 1.75% and 2.75% per annum or (b) the “base rate,” which is the highest of (i) the federal funds rate plus 0.5%, (ii) the prime rate published by Bank of America or (iii) the Eurodollar rate (as defined in the senior credit facility) plus 1.00% per annum, plus, in each case under scenario (b), an applicable margin between 0.75% and 1.75% per annum. Interest is payable quarterly for base rate loans and at the applicable maturity date for LIBOR loans, except that if the interest period for a LIBOR loan is six months, interest is paid at the end of each three-month period.
Line of credit facility, unused capacity, commitment fee percentage						0.50%
Line of credit facility maximum borrowings capacity					775,000,000	775,000,000	775,000,000	775,000,000									1,000,000,000
Line of credit facility, amount outstanding					0	0
Line of credity facility, letters of credit outstanding	28,600,000		28,600,000
Debt issuance cost	70,200,000		70,200,000																																			41,000,000
Long-term debt, fixed interest rate																		9.875%		9.875%	8.00%		8.00%		7.50%	7.50%			7.50%	7.50%			8.125%	8.125%
Debt instrument issuance date, month and year																												August 2012								April 2012
Debt instrument, face amount																												825,000,000				275,000,000				750,000,000
Net proceeds from Senior Notes issued																																			730,100,000		1,100,000,000
Selling price of Senior Notes issued																											99.50%				101.625%
Debt tender offer, aggregate principal amount tendered																			365,500,000			750,000,000
Debt instrument redemption price per principal amount																			1,061.34			1,052.77
Premium paid to purchase notes and unamortized debt issuance cost in relation to the notes	0	0	82,005,000	0																				82,005,000
Debt instrument, restrictive covenants																																								Each of the indentures governing the Company’s Senior Fixed Rate Notes contains covenants that restrict the Company’s ability to take a variety of actions, including limitations on the incurrence of indebtedness, payment of dividends, investments, asset sales, certain asset purchases, transactions with related parties and consolidations or mergers.
Debt instrument, covenant compliance																																							As of and during the three and six-month periods ended June 30, 2013, the Company was in compliance with all of the covenants contained in the indentures governing its senior notes.	As of and during the three and six-month periods ended June 30, 2013, the Company was in compliance with all of the covenants contained in the indentures governing its senior notes.
Percentage of aggregate senior notes outstanding principal amount purchased																																											94.30%
Debt tender offer, aggregate principal amount tendered																																											329,900,000
Aggregate senior notes outstanding principal amount purchased																																										$ 20,100,000

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States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

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Description of covenants that limit or prohibit certain actions or activities without the lender's prior consent within a specified period of time or until certain specified targets are achieved for example, reduction of the debt or an increase in net worth to a specified amount).

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Discussion of whether the borrowings under the credit facility are secured or unsecured and, if secured, a description of collateral (for example, accounts receivable less than 120 days old, finished goods inventory).

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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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