Dispositions - Additional Information (Detail) (USD $)	3 Months Ended		1 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013 Permian basin Mcfe acre
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Area of property, gross			90,000
Area of property, net			70,000
Production per day			28,000
Proceeds from sale of oil and gas	$ 294,000	$ 38,200,000
Gain (loss) on disposition of oil and gas property	$ (353,000)	$ (166,000)