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Long-Term Debt - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Senior credit facility
Sep. 30, 2013
Senior credit facility
Oct. 31, 2013
Senior credit facility
Mar. 31, 2013
Senior credit facility
Aug. 31, 2012
Senior credit facility
Sep. 30, 2013
Senior credit facility
Minimum
Sep. 30, 2013
Senior credit facility
Maximum
Sep. 30, 2013
Senior credit facility
Addition to federal funds rate
Sep. 30, 2013
Senior credit facility
Applicable margin to base rate per annum
Minimum
Sep. 30, 2013
Senior credit facility
Applicable margin to base rate per annum
Maximum
Aug. 31, 2012
Senior credit facility
Prior to additional debt issuance
Sep. 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
Sep. 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
Sep. 30, 2013
9.875% Senior Notes and 8.0% Senior Notes
Sep. 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
Sep. 30, 2013
7.5% Senior Notes due 2023
2012 Activity
Sep. 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
Sep. 30, 2013
7.5% Senior Notes due 2021
2012 Activity
Sep. 30, 2013
8.125% Senior Notes due 2022
Dec. 31, 2012
8.125% Senior Notes due 2022
Apr. 30, 2012
8.125% Senior Notes due 2022
Apr. 30, 2012
8.125% Senior Notes due 2022
2012 Activity
Aug. 31, 2012
2012 Senior Notes
2012 Activity
Dec. 31, 2012
2012 Senior Notes
2012 Activity
Sep. 30, 2013
Senior Notes
Sep. 30, 2013
Senior Notes
Sep. 30, 2012
Senior Floating Rate Notes due 2014
Sep. 30, 2013
LIBOR
Senior credit facility
Addition to LIBOR per annum
Minimum
Sep. 30, 2013
LIBOR
Senior credit facility
Addition to LIBOR per annum
Maximum
Sep. 30, 2013
Euro Dollar Rate
Senior credit facility
Addition to Eurodollar rate per annum
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 nine-month periods ended September 30, 2013, the Company was in compliance with all applicable financial covenants under the senior credit facility. As of and during the three and nine-month periods ended September 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                       0.50% 0.75% 1.75%                                                 3.625% 1.75% 2.75% 1.00%
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, unused capacity, commitment fee percentage           0.50%                                                                        
Line of credit facility maximum borrowings capacity         775,000,000 775,000,000 775,000,000 775,000,000 775,000,000           1,000,000,000                                                      
Line of credit facility, amount outstanding         0 0                                                                        
Line of credity facility, letters of credit outstanding 27,600,000   27,600,000                                                                              
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% 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 3,056,000 82,005,000 3,056,000                                   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 nine-month periods ended September 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 nine-month periods ended September 30, 2013, the Company was in compliance with all of the covenants contained in the indentures governing its senior notes.        
Debt instrument, repurchased percentage   100.00%   100.00%                                                                            
Debt instrument, repurchased face amount   $ 350,000,000   $ 350,000,000