v3.10.0.1

Derivative Instruments and Fair Value Measurements - Summary of Commodity Derivatives (Loss) Gain (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives Fair Value [Line Items]
Commodity derivative (loss) gain	$ (4,884)	$ 1,231	$ (6,812)	$ 4,675
Derivatives Not Designated as Hedging Instruments [Member] | Net Cash (Payment) Receipt on Derivatives Settlements [Member]
Derivatives Fair Value [Line Items]
Commodity derivative (loss) gain	(1,982)	3	(3,513)	(958)
Derivatives Not Designated as Hedging Instruments [Member] | Non-Cash Fair Value (Loss) Gain on Derivatives [Member]
Derivatives Fair Value [Line Items]
Commodity derivative (loss) gain	(2,902)	$ 1,228	(3,299)	$ 5,633
Derivatives Designated as Hedging [Member] | Cash Flow Hedges [Member] | Oil, NGLs and Gas Sales [Member]
Derivatives Fair Value [Line Items]
Commodity derivative (loss) gain	$ 62		$ 62

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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