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Indebtedness - Early Extinguishment of Debt, Guarantees, and Debt Covenants and Maturity - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 1 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Apr. 30, 2013
7.25% Senior Subordinated notes due 2018
Dec. 31, 2012
7.5% senior subordinated notes due 2017
Jun. 24, 2011
6.375% Senior Subordinated notes due 2015
May 25, 2011
6.375% Senior Subordinated notes due 2015
May 31, 2011
6.375% Senior Subordinated notes due 2015
Jun. 24, 2011
7.5% senior subordinated notes due 2016, net of discount
May 25, 2011
7.5% senior subordinated notes due 2016, net of discount
May 31, 2011
7.5% senior subordinated notes due 2016, net of discount
Debt Instrument [Line Items]                          
Announced call for redemption amount of debt           $ 250,000,000   $ 41,100,000 $ 108,900,000   $ 51,200,000 $ 198,800,000  
Aggregate principal amount of senior subordinated notes                   150,000,000     250,000,000
Debt redemption price percent of par           103.625% 103.75% 102.125% 102.375%   103.75% 104.00%  
Loss on early extinguishment of debt $ (12,280,000) $ (11,063,000) $ (12,280,000) $ (11,063,000) $ (18,576,000)   $ 11,100,000            
Ratio of debt to EBITDAX     4.25                    
Current ratio     1.0                    
Debt instrument, Covenant compliance     Our bank credit facility contains negative covenants that limit our ability, among other things, to pay cash dividends, incur additional indebtedness, sell assets, enter into certain hedging contracts, change the nature of our business or operations, merge, consolidate, or make investments. In addition, we are required to maintain a ratio of debt to EBITDAX (as defined in the credit agreement) of no greater than 4.25 to 1.0 and a ratio of current assets, including availability under the bank credit facility, to current liabilities of no less than 1.0 to 1.0 (as defined in the credit agreement). We were in compliance with our covenants under the bank credit facility at December 31, 2013. The indentures governing our senior subordinated notes contain various restrictive covenants that are substantially identical to each other and may limit our ability to, among other things, pay cash dividends, incur additional indebtedness, sell assets, enter into transactions with affiliates, or change the nature of our business. At December 31, 2013, we were in compliance with these covenants.