Long-Term Debt - Additional Information (Detail) - USD ($)
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3 Months Ended |
12 Months Ended |
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Dec. 15, 2015 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Dec. 31, 2015 |
Dec. 31, 2013 |
Dec. 31, 2014 |
| Line of Credit Facility [Line Items] |
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| Senior notes, net |
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$ 225,839,000
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$ 225,839,000
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$ 244,239,000
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| Proceeds from issuance of senior notes |
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$ 242,824,000
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| Gain on extinguishment of debt |
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9,080,000
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$ 1,483,000
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10,563,000
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| Semi-annual interest payment amount |
$ 8,600,000
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| Senior Notes [Member] |
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| Line of Credit Facility [Line Items] |
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| Senior notes, net |
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225,839,000
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$ 225,839,000
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244,239,000
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| Senior Notes [Member] | 7% Senior Notes Originated June 11, 2013 [Member] |
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| Line of Credit Facility [Line Items] |
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| Senior Notes maturity date |
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Jun. 15, 2021
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| Senior notes, net |
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$ 250,000,000
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$ 250,000,000
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| Stated interest rate |
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7.00%
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7.00%
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| Debt instrument payment of interest |
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Semi-annually on June 15 and December 15.
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| Proceeds from issuance of senior notes |
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$ 243,000,000
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| Repurchased price of senior notes |
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8,800,000
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| Repurchased senior notes face value |
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$ 19,700,000
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19,700,000
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| Gain on extinguishment of debt |
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$ 10,600,000
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| Senior Notes [Member] | 7% Senior Notes Originated June 11, 2013 [Member] | Debt Instrument, Redemption, Period One [Member] |
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| Line of Credit Facility [Line Items] |
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| Debt instrument redemption description |
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Before June 15, 2016, we may redeem up to 35% of the Senior Notes at a redemption price of 107% of the principal amount, plus accrued and unpaid interest to the redemption date, with the proceeds of certain equity offerings.
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| Debt instrument, redemption percentage |
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35.00%
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| Debt instrument, redemption of principal amount percentage |
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107.00%
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| Senior Notes [Member] | 7% Senior Notes Originated June 11, 2013 [Member] | Debt Instrument, Redemption, Period Two [Member] |
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| Line of Credit Facility [Line Items] |
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| Debt instrument redemption description |
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Before June 15, 2016, we may redeem some or all of the Notes for cash at a redemption price equal to 100% of their principal amount plus an applicable make-whole premium and accrued and unpaid interest to the redemption date.
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| Debt instrument, redemption of principal amount percentage |
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100.00%
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| Senior Secured Credit Facility [Member] |
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| Line of Credit Facility [Line Items] |
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| Maturity period of senior secured credit facility |
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May 07, 2019
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| Senior secured credit facility, borrowing base |
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450,000,000
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$ 450,000,000
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| Aggregate lender commitments |
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450,000,000
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450,000,000
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| Senior secured facility, maximum borrowing capacity |
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1,000,000,000
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$ 1,000,000,000
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| Senior secured credit facility, interest rate description |
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Borrowings under the Credit Facility bear interest based on the agent bank's prime rate plus an applicable margin ranging from 0.50% to 1.50%, or the sum of the LIBOR rate plus an applicable margin ranging from 1.50% to 2.50%. In addition, we pay an annual commitment fee ranging from 0.375% to 0.50% of unused borrowings available
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| Senior secured credit facility |
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273,000,000
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$ 273,000,000
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150,000,000
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| Interest rate applicable of senior secured credit facility |
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2.20%
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| Unused letters of credit outstanding |
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$ 300,000
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$ 300,000
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$ 300,000
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| Production from liens covering the oil and gas properties |
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80.00%
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| Minimum current ratio |
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1.0
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| Interest coverage ratio |
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2.5
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| Outstanding equity interests ownership percentage |
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50.00%
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50.00%
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| Senior Secured Credit Facility [Member] | Covenants Agreements One [Member] |
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| Line of Credit Facility [Line Items] |
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| Covenant description |
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A consolidated modified current ratio covenant (as defined in the Credit Facility) that requires us to maintain a ratio of not less than 1.0 to 1.0 as of the last day of any fiscal quarter
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| Senior Secured Credit Facility [Member] | Covenants Agreements Two [Member] |
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| Line of Credit Facility [Line Items] |
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| Covenant description |
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A consolidated interest coverage ratio covenant (as defined in the Credit Facility) that requires us to maintain a ratio of consolidated EBITDAX to interest of not less than 2.5 to 1.0 as of the last day of any fiscal quarter.
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| Senior Secured Credit Facility [Member] | Minimum [Member] |
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| Line of Credit Facility [Line Items] |
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| Annual commitment fee of unused borrowings |
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0.375%
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| Senior Secured Credit Facility [Member] | Minimum [Member] | Prime Rate [Member] |
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| Line of Credit Facility [Line Items] |
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| Senior secured credit facility, marginal percentage |
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0.50%
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| Senior Secured Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |
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| Line of Credit Facility [Line Items] |
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| Senior secured credit facility, marginal percentage |
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1.50%
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| Senior Secured Credit Facility [Member] | Maximum [Member] |
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| Line of Credit Facility [Line Items] |
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| Annual commitment fee of unused borrowings |
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0.50%
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| Senior Secured Credit Facility [Member] | Maximum [Member] | Prime Rate [Member] |
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| Line of Credit Facility [Line Items] |
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| Senior secured credit facility, marginal percentage |
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1.50%
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| Senior Secured Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |
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| Line of Credit Facility [Line Items] |
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| Senior secured credit facility, marginal percentage |
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2.50%
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