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Receivables - Receivables (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 46,327		$ 39,278
Oil and Gas Joint Interest Billing Receivables	11,220		3,896
Allowance for bad debts	(26)		(26)
Receivables, net	46,301		39,252
Loan secured by real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,236		7,610
Notes receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	8,234		7,987
Average interest rate	4.40%	5.00%
Oil and gas revenue accrual receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	18,753		8,137
Receivables and accrued interest [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 3,884		$ 11,648

X

- Definition

Accounts and notes receivable gross.

+ References

No definition available.

+ Details

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X

- Definition

Average interest rates.

+ References

No definition available.

+ Details

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X

- Definition

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)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5



Reference 2: 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=35738203&loc=d3e5074-111524



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- 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

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