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Receivables - Receivables (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 13,455 | $ 24,847
Oil and Gas Joint Interest Billing Receivables | 1,439 | 5,738
Allowance for bad debts | (243) | (258)
Receivables, net | 13,212 | 24,589
Oil and gas revenue accrual receivable [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 5,825 | 7,293
Receivables and accrued interest [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 4,146 | 6,505
Notes receivable [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 2,045 | $ 1,737
Average interest rate | 11.12% | 4.41%
Loan secured by real estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 0 | $ 3,574

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- Definition Portion of accounts receivable attributable to joint interest partners in oil and gas properties. These are billings to the non-operators associated with the operation of wells and are based on those owners' working interests in the wells. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 323 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6474814&loc=d3e64006-109457 + Details
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