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Summary of Significant Accounting Policies - Schedule of Fair Value Impairments, Average Prices of Oil and Gas Properties And Applicable Discount Rates (Detail) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) $ / bbl $ / Mcf	Sep. 30, 2015 USD ($) $ / bbl $ / Mcf	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Fair Value And Impairments Oil And Gas Properties [Line Items]
Impairment of oil and gas properties	$ 2,561	$ 113	$ 1,742	$ 22,718	$ 254,246	$ 544,714	$ 1,984	$ 403	$ 27,134	$ 801,347	$ 60,268
Oil Properties
Fair Value And Impairments Oil And Gas Properties [Line Items]
Fair Value					3,030	330,257				3,030
Impairment of oil and gas properties					$ 16,036	$ 405,308
Management's Oil Price Outlook | $ / bbl					73.48	73.70
Management's Gas Price Outlook | $ / Mcf						4.04
Oil Properties | Minimum
Fair Value And Impairments Oil And Gas Properties [Line Items]
Annual Discount Rate					10.00%	10.00%
Oil Properties | Maximum
Fair Value And Impairments Oil And Gas Properties [Line Items]
Annual Discount Rate					20.00%	20.00%
Natural Gas Properties
Fair Value And Impairments Oil And Gas Properties [Line Items]
Fair Value					$ 123,926	$ 61,625				$ 123,926
Impairment of oil and gas properties					$ 238,210	$ 139,406
Management's Oil Price Outlook | $ / bbl					70.76	75.91
Management's Gas Price Outlook | $ / Mcf					3.74	3.91
Natural Gas Properties | Minimum
Fair Value And Impairments Oil And Gas Properties [Line Items]
Annual Discount Rate					10.00%	10.00%
Natural Gas Properties | Maximum
Fair Value And Impairments Oil And Gas Properties [Line Items]
Annual Discount Rate					20.00%	20.00%

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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)
-URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 360
-Section 35
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66906256&loc=d3e66150-109466

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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