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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Components of Assets and Liabilities of Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]  
Accounts Receivable $ 5,924
Other Current Assets 1,644
Total Current Assets 7,568
Unproved Oil and Gas Properties 150,801
Proved Oil and Gas Properties:  
Leasehold Costs 225,546
Wells and related equipment and facilities 180,475
Other 673
Accumulated depreciation, depletion and amortization (46,129)
Net Property and Equipment 511,366
Total Assets of Discontinued Operations 518,934
Accounts Payable 21,302
Accrued Liabilities 10,371
Reserve for Future Abandonment Costs 1,607
Liabilities of Discontinued Operations $ 33,280