Oil and Gas Producing Activities - Capitalized Costs Related to Oil and Gas Property Acquisition Exploration and Development Activities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Proved properties:
Leasehold costs	$ 491,507	$ 662,022
Wells and related equipment and facilities	2,140,243	3,135,079
Accumulated depreciation depletion and amortization	(2,032,927)	(3,009,236)
Capitalized costs, oil and gas producing activities, net, total	$ 598,823	$ 787,865

Capitalized costs lease hold costs.

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- Definition

Amount of accumulated depreciation, depletion, amortization and valuation allowance relating to oil and gas producing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447

+ Details

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- Definition

Net amount of capitalized costs relating to oil and gas producing activities.

+ References

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- References

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- Definition

Capitalized costs which include those incurred to (1) to drill and equip those exploratory wells and exploratory-type stratigraphic test wells that have found proved reserves and (2) obtain access to proved reserves and provide facilities for extracting, treating, gathering, storing the oil and gas, including the drilling and equipping of development wells and development-type stratigraphic wells and service wells.

+ References

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