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Property and Equipment - Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Proved oil and gas properties, at cost	$ 520,016	$ 514,821
Less: Accumulated depletion and depreciation	(299,753)	(291,152)
Oil and Gas Properties, Net	220,263	223,669
Field and office equipment	27,406	27,252
Less: Accumulated depreciation	(20,872)	(20,496)
Field and office equipment, net	6,534	6,756
Total Property and Equipment, Net	$ 226,797	$ 230,425

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Field service equipment and other.

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

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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, gross, carried under the successful effort method.

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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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