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Property and Equipment - Components of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Property Plant And Equipment [Abstract]
Proved oil and gas properties, at cost	$ 354,877	$ 338,204
Less: Accumulated depletion and depreciation	(164,414)	(150,276)
Oil and Gas Properties, Net	190,463	187,928
Field and office equipment	26,799	23,974
Less: Accumulated depreciation	(15,807)	(15,052)
Field and Office Equipment, Net	10,992	8,922
Total Property and Equipment, Net	$ 201,455	$ 196,850

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- Definition

Field service equipment and other.

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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-Subparagraph (c)

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Amount of accumulated depreciation, depletion and amortization of oil and gas property carried under the successful effort method. Oil and gas property include, but not limited to, the entity's wells and related equipment and facilities.

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Oil and gas properties net of accumulated depreciation, depletion, amortization, impairment, and abandonment, carried under the successful effort method.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Oil and Gas properties with proved reserves under the successful effort method.

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