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Segment Information and Major Customers - Segment Information by Major Customers (Detail) - Sales [Member] - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2018
Oil Purchasers [Member] | Apache Corporation [Member]
Revenue, Major Customer [Line Items]
Revenue by major customers	50.90%
Oil Purchasers [Member] | Plains All American Inc., Oil Purchasers [Member]
Revenue, Major Customer [Line Items]
Revenue by major customers	17.80%
Natural gas and liquids [Member] | Apache Corporation [Member]
Revenue, Major Customer [Line Items]
Revenue by major customers	35.60%
Natural gas and liquids [Member] | Targa Pipeline Mid-Continent West Tex, LLC [Member]
Revenue, Major Customer [Line Items]
Revenue by major customers	21.40%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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-Subparagraph (a)
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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X

- 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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