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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
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12 Months Ended |
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Dec. 31, 2013
Segment
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Dec. 31, 2012
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Dec. 31, 2011
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| Organization and Summary of Significant Accounting Policies Disclosure [Line Items] |
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| Senior notes, principal |
$ 400,000,000 |
$ 400,000,000 |
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| Senior notes, maturity |
May
01,
2020 |
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| Number Of Operating Segment |
1 |
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| Deferred financing cost |
1,900,000 |
12,300,000 |
200,000 |
| Deferred financing cost amortization interest expense |
2,700,000 |
1,700,000 |
1,000,000 |
| Capitalized Interest |
15,900,000 |
4,700,000 |
1,300,000 |
| Capitalized general and administrative and operating costs |
8,400,000 |
6,000,000 |
5,200,000 |
| Discount factor |
10.00% |
10.00% |
10.00% |
| Ceiling test write-down of oil and gas properties |
188,000,000 |
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| Restricted cash |
18,200,000 |
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Future Net Revenue from Proved Oil and Gas Reserves
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| Organization and Summary of Significant Accounting Policies Disclosure [Line Items] |
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| Discount factor |
10.00% |
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Customer Concentration Risk | Western Refining, Inc.
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| Organization and Summary of Significant Accounting Policies Disclosure [Line Items] |
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| Concentration of credit risk percentage |
61.00% |
78.00% |
82.00% |
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Customer Concentration Risk | Plains Marketing LP
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| Organization and Summary of Significant Accounting Policies Disclosure [Line Items] |
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| Concentration of credit risk percentage |
15.00% |
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Minimum
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| Organization and Summary of Significant Accounting Policies Disclosure [Line Items] |
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| Unproved properties, evaluation time for existence of proved reserves |
1 year |
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| Discount factor |
7.00% |
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Maximum
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| Organization and Summary of Significant Accounting Policies Disclosure [Line Items] |
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| Unproved properties, evaluation time for existence of proved reserves |
3 years |
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| Discount factor |
12.00% |
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Office furniture, automobiles, and computer hardware and software | Minimum
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| Organization and Summary of Significant Accounting Policies Disclosure [Line Items] |
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| Property and equipment estimated useful life |
3 years |
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Office furniture, automobiles, and computer hardware and software | Maximum
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| Organization and Summary of Significant Accounting Policies Disclosure [Line Items] |
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| Property and equipment estimated useful life |
5 years |
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Field offices and partial ownership of aircraft | Minimum
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| Organization and Summary of Significant Accounting Policies Disclosure [Line Items] |
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| Property and equipment estimated useful life |
15 years |
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Field offices and partial ownership of aircraft | Maximum
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| Organization and Summary of Significant Accounting Policies Disclosure [Line Items] |
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| Property and equipment estimated useful life |
20 years |
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Senior Notes
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| Organization and Summary of Significant Accounting Policies Disclosure [Line Items] |
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| Senior notes, principal |
$ 400,000,000 |
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