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Long-Term Debt - Additional Information (Detail) (USD $)	3 Months Ended													3 Months Ended							3 Months Ended		1 Months Ended		1 Months Ended		0 Months Ended		1 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Senior credit facility	Aug. 31, 2012 Senior credit facility	Mar. 31, 2013 Senior credit facility Minimum	Mar. 31, 2013 Senior credit facility Maximum	Mar. 31, 2013 Senior credit facility LIBOR Minimum	Mar. 31, 2013 Senior credit facility LIBOR Maximum	Mar. 31, 2013 Senior credit facility Eurodollar Rate	Mar. 31, 2013 9.875% Senior Notes due 2016	Dec. 31, 2012 9.875% Senior Notes due 2016	Mar. 31, 2013 8.0% Senior Notes due 2018	Dec. 31, 2012 8.0% Senior Notes due 2018	Mar. 31, 2013 9.875% Senior Notes and 8.0% Senior Notes	Mar. 31, 2013 7.5% Senior Notes due 2023	Dec. 31, 2012 7.5% Senior Notes due 2023	Mar. 31, 2013 7.5% Senior Notes due 2021	Dec. 31, 2012 7.5% Senior Notes due 2021	Mar. 31, 2013 8.125% Senior Notes due 2022	Dec. 31, 2012 8.125% Senior Notes due 2022	Mar. 31, 2013 Senior Notes	Aug. 06, 2012 Senior Floating Rate Notes due 2014	Aug. 31, 2012 2012 Activity 7.5% Senior Notes due 2023	Mar. 31, 2013 2012 Activity 7.5% Senior Notes due 2023	Aug. 31, 2012 2012 Activity 7.5% Senior Notes due 2021	Mar. 31, 2013 2012 Activity 7.5% Senior Notes due 2021	Apr. 17, 2012 2012 Activity 8.125% Senior Notes due 2022	Mar. 31, 2013 2012 Activity 8.125% Senior Notes due 2022	Aug. 31, 2012 2012 Activity 2012 Senior Notes	Mar. 31, 2013 2012 Activity 2012 Senior Notes	Aug. 31, 2012 Tendered by August 17, 2012 Senior Floating Rate Notes due 2014	Sep. 04, 2012 Tendered after August 17, 2012 Senior Floating Rate Notes due 2014
Debt Instrument [Line Items]
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
Debt maturity date			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-month period ended March 31, 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.
Minimum collateral amount of proved oil and gas reserves representing the discounted present value of reserves used in borrowing base determination			80.00%
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, interest rate, applicable margin					0.75%	1.75%	1.75%	2.75%	1.00%
Line of credit facility, interest rate in addition to federal funds rate			0.50%
Line of credit facility, unused capacity, commitment fee percentage			0.50%
Line of credit facility maximum borrowings capacity			775,000,000	775,000,000
Line of credit facility borrowing capacity prior to additional debt issuance				1,000,000,000
Line of credit facility, amount outstanding			0
Letters of credit, outstanding	30,200,000
Debt issuance cost	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 tender offer, aggregate principal amount tendered										365,500,000		750,000,000
Debt instrument issuance date, month and year																								August 2012				April 2012
Debt instrument redemption price per principal amount										1,061.34		1,052.77
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 instrument, covenant compliance																					As of and during the three and three-month periods ended March 31, 2013, the Company was in compliance with all of the covenants contained in the indentures governing its senior notes.
Long-term debt, interest rate above LIBOR																						3.625%
Percentage of aggregate senior notes outstanding principal amount purchased																															94.30%
Premium paid to purchase notes and unamortized debt issuance cost in relation to the notes	82,005,000	0												82,005,000
Debt instrument, restrictive covenants																					The indentures governing the Company’s senior notes contain covenants which 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.
Aggregate senior notes outstanding principal amount purchased																																20,100,000
Debt tender offer, aggregate principal amount tendered																															$ 329,900,000

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