Cash spent for the amount impaired.

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- Definition

Property, plant and equipment not placed in service.

+ References

No definition available.

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- Definition

The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-10(c)(7)(ii))
-URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862

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-Name Accounting Standards Codification
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- Definition

The sum of the capitalized costs incurred during the period of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs.

+ 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Wells and Related Equipment and Facilities
-URI http://asc.fasb.org/extlink&oid=6528444

Reference 2: 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

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- Definition

The amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 1B
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447

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- Definition

The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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- Definition

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ 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 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Dry hole costs from oil and gas producing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 360
-Section 25
-Paragraph 9
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Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 30, 2015
Property Plant And Equipment [Line Items]
Proved development wells excluded from depletion	$ 1,900	$ 700
Acquisition costs of proved properties	13,200	18,000
Well costs and additional development costs	66,700	100,700
Exploratory dry hole costs	4,500
Impairment charge on well		16,000	$ 19,900
Cash spent for the amount impaired	1,500
Inventory	3,647
Inventory [Member]
Property Plant And Equipment [Line Items]
Property plant and equipment excluded from depreciation	14,400			$ 21,300
Unproved Properties [Member]
Property Plant And Equipment [Line Items]
Impairment charge on well			13,800
Exploratory Well Impairments [Member]
Property Plant And Equipment [Line Items]
Impairment charge on well	1,700
License Impairments [Member]
Property Plant And Equipment [Line Items]
Impairment charge on well	300
Molla And Bakuk Field \| Turkey [Member]
Property Plant And Equipment [Line Items]
Impairment charge on well		5,800
Deventci-R2 well [Member] \| Bulgaria [Member]
Property Plant And Equipment [Line Items]
Impairment charge on well		3,700
Pinar - 1 well [Member] \| Turkey [Member]
Property Plant And Equipment [Line Items]
Impairment charge on well		3,500
Exploratory drilling costs capitalized	1,800
South Goksu-1 well \| Turkey [Member]
Property Plant And Equipment [Line Items]
Impairment charge on well		$ 700
Catak-1 Well [Member] \| Unproved Properties [Member]
Property Plant And Equipment [Line Items]
Impairment charge on well			3,500
Kazanci-5 Well [Member] \| Unproved Properties [Member]
Property Plant And Equipment [Line Items]
Impairment charge on well			2,800
Bahar-2 Side Track Well [Member] \| Unproved Properties [Member]
Property Plant And Equipment [Line Items]
Impairment charge on well			$ 7,500
Hayrabolu-10 well [Member] \| Turkey [Member]
Property Plant And Equipment [Line Items]
Exploratory drilling costs capitalized	1,000
TNBG [Member]
Property Plant And Equipment [Line Items]
Impairment charge on well	$ 2,500