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Receivables - Receivables (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 14,847		$ 24,847
Oil and Gas Joint Interest Billing Receivables	2,055		5,738
Allowance for bad debts	(237)		(258)
Receivables, net	14,610		24,589
Oil and gas revenue accrual receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	6,673		7,293
Receivables and accrued interest [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,171		6,505
Notes receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 1,948		1,737
Average interest rate	10.68%	4.41%
Loan secured by real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 0		$ 3,574

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Accounts and notes receivable gross.

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Carrying amount as of the balance sheet date, net of allowance for doubtful accounts, of account and note receivables due from other than related parties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.3-4)



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- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 4



-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524



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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



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