v3.10.0.1

Long-Term Debt - Additional Information (Detail) |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 21, 2017 USD ($) | Dec. 20, 2017 | Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |
Senior secured credit facility |  |  | $ 295,500,000 | $ 295,500,000 | $ 291,000,000
7% Senior Notes Due 2021 [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Senior notes outstanding |  |  | 85,200,000 | 85,200,000 | 85,200,000
Senior Secured Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Senior secured credit facility, borrowing base |  |  | 325,000,000 | 325,000,000 |
Senior secured facility, maximum borrowing capacity |  |  | 1,000,000,000 | $ 1,000,000,000 |
Maturity period of senior secured credit facility | May 07, 2020 | May 07, 2019 |  | May 07, 2020 |
Additional borrowing base, re-determination description |  |  |  | We, or the lenders, can each request one additional borrowing base redetermination each calendar year. Our semi-annual borrowing base redetermination is not yet final. |
Annual commitment fee of unused borrowings |  |  |  | 0.50% |
Senior secured credit facility, interest rate description |  |  |  | Borrowings under the Credit Facility bore 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. |
Senior secured credit facility |  |  | $ 295,500,000 | $ 295,500,000 | 291,000,000
Interest rate applicable of senior secured credit facility |  |  | 6.10% |  |
Unused letters of credit outstanding |  |  | $ 300,000 | $ 300,000 | 300,000
Production from liens covering the oil and gas properties |  |  |  | 95.00% |
Required percentage of anticipated production to be hedged | 50.00% |  |  |  |
Increase in applicable margin rates on borrowings | 0.50% |  |  |  |
Debt issuance costs | $ 1,000,000 |  | $ 1,179,000 | $ 1,179,000 | $ 1,725,000
Consolidated interest coverage ratio |  |  | 2.6 | 2.6 |
Consolidated modified current ratio |  |  | 1.2 | 1.2 |
Outstanding equity interests ownership percentage |  |  | 50.00% | 50.00% |
Senior Secured Credit Facility [Member] | Covenants Agreements One [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Covenant description |  |  |  | A consolidated interest coverage ratio covenant (as defined in the Credit Facility) that requires us to maintain a ratio of consolidated EBITDAX (as defined in the Credit Facility) to cash Interest Expense (as defined in the Credit Facility) as of the last day of any fiscal quarter of not less than 1.25 to 1.0 (or 1.0 to 1.0 following the issuance of second lien indebtedness) through December 31, 2017, a ratio of not less than 1.5 to 1.0 through December 31, 2018, and a ratio of not less than 2.0 to 1.0 thereafter, and 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. |
Minimum interest coverage ratio, through December 31, 2018 |  |  |  | 1.75 |
Minimum interest coverage ratio, through December 31, 2019 |  |  |  | 2.25 |
Interest coverage ratio, thereafter |  |  |  | 2.5 |
Senior Secured Credit Facility [Member] | Covenants Agreements Two [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Minimum current ratio |  |  |  | 1.0 |
Senior Secured Credit Facility [Member] | Minimum [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Leverage ratio |  |  | 1.0 | 1.0 |
Senior Secured Credit Facility [Member] | Minimum [Member] | Prime Rate [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Senior secured credit facility, marginal percentage |  |  |  | 2.00% |
Senior Secured Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Senior secured credit facility, marginal percentage |  |  |  | 3.00% |
Senior Secured Credit Facility [Member] | Maximum [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Leverage ratio |  |  | 6.4 | 6.4 |
Senior Secured Credit Facility [Member] | Maximum [Member] | Covenants Agreements Three [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Leverage ratio, March 31, 2019 |  |  |  | 5.0 |
Leverage ratio, through June 30, 2019 |  |  |  | 5.0 |
Leverage ratio, September 30, 2019 |  |  |  | 4.75 |
Leverage ratio, through December 31, 2019 |  |  |  | 4.75 |
Leverage ratio, thereafter |  |  |  | 4.0 |
Senior Secured Credit Facility [Member] | Maximum [Member] | Prime Rate [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Senior secured credit facility, marginal percentage |  |  |  | 3.00% |
Senior Secured Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Senior secured credit facility, marginal percentage |  |  |  | 4.00% |

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