Sale of Oil and Natural Gas Property Interests - Additional Information (Detail)	3 Months Ended
Mar. 31, 2016 USD ($)
Discontinued Operations And Disposal Groups [Abstract]
Proceeds from sale of unproved lease properties	$ 4,800,000
Gain (loss) on sale of unproved properties	$ 0

Amount of gain (loss) on sale or disposal of property without proven oil and gas reserves.

Reference 1: 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

Name:	us-gaap_GainLossOnSaleOfUnprovedProperty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration