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Additional Balance Sheet Information - Components of Balance Sheet Amounts (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Accounts Receivable:    
Joint interest billing $ 2,995 $ 2,882
Trade receivables 1,599 1,980
Oil and gas sales 6,483 6,245
Other 1,761 1,751
Accounts Receivable, Gross 12,838 12,858
Less: Allowance for doubtful accounts (493) (543)
Total 12,345 12,315
Accounts Payable:    
Trade 2,427 3,995
Royalty and other owners 8,441 8,444
Partner advances 1,442 1,344
Prepaid drilling deposits   786
Other 1,452 1,689
Total 13,762 16,258
Accrued Liabilities:    
Compensation and related expenses 2,920 2,350
Property costs 3,461 9,204
Income tax 579 554
Other 605 293
Total $ 7,565 $ 12,401