v3.10.0.1

Derivative Instruments and Fair Value Measurements - Summary of Commodity Derivatives (Loss) Gain (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives Fair Value [Line Items]
Commodity derivative (loss) gain	$ (3,256)	$ (3,560)	$ (10,068)	$ 1,115
Derivatives Not Designated as Hedging Instruments [Member] | Net Cash (Payment) Receipt on Derivatives Settlements [Member]
Derivatives Fair Value [Line Items]
Commodity derivative (loss) gain	(3,172)	(523)	(6,685)	(1,481)
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	(84)	$ (3,037)	(3,383)	$ 2,596
Derivatives Designated as Hedging [Member] | Cash Flow Hedges [Member] | Oil, NGLs and Gas Sales [Member]
Derivatives Fair Value [Line Items]
Commodity derivative (loss) gain	$ (85)		$ (23)

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- Definition

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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