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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Changes in Reserve for Future Abandonment Costs (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012
Asset Retirement Obligations [Line Items] |  |
Future abandonment costs – beginning of period | $ 16,387 | $ 13,997
Accretion expense – continuing operations | 494 | 331
Accretion expense – discontinued operations |  | 19
New wells placed on production – continuing operations | 313 | 503
New wells placed on production– discontinued operations |  | 441
Liabilities settled and assets disposed of – continuing operations | (534) | (1,077)
Liabilities settled and assets disposed of – discontinued operations |  | (23)
Liabilities reclassified to discontinued operations |  | (1,179)
Future abandonment costs – end of period | $ 16,660 | $ 13,012

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