Derivative Instruments (Derivative Contracts) (Detail) (USD $)	9 Months Ended
Sep. 30, 2014
Derivative [Line Items]
Fair Value	$ (240,131)
Crude Oil Swap \| Derivative Instrument 2
Derivative [Line Items]
Monthly Volumes Bbls	5,800
Price/bbl	88.55
Fair Value	54,288
Crude Oil Swap \| Derivative Instrument 3
Derivative [Line Items]
Monthly Volumes Bbls	3,000
Price/bbl	95.15
Fair Value	44,460
Crude Oil Swap \| Derivative Instrument 4
Derivative [Line Items]
Monthly Volumes Bbls	2,850
Price/bbl	83.70
Fair Value	(190,463)
Crude Oil Swap \| Derivative Instrument 6
Derivative [Line Items]
Monthly Volumes Bbls	1,240
Price/bbl	76.74
Fair Value	(221,262)
Crude Oil Swap \| Derivative Instrument 7
Derivative [Line Items]
Monthly Volumes Bbls	1,380
Price/bbl	90.25
Fair Value	162
Crude Oil Swap \| Minimum \| Derivative Instrument 2
Derivative [Line Items]
Term	2015-01
Crude Oil Swap \| Minimum \| Derivative Instrument 3
Derivative [Line Items]
Term	2013-09
Crude Oil Swap \| Minimum \| Derivative Instrument 4
Derivative [Line Items]
Term	2011-07
Crude Oil Swap \| Minimum \| Derivative Instrument 6
Derivative [Line Items]
Term	2012-07
Crude Oil Swap \| Minimum \| Derivative Instrument 7
Derivative [Line Items]
Term	2014-01
Crude Oil Swap \| Maximum \| Derivative Instrument 2
Derivative [Line Items]
Term	2015-12
Crude Oil Swap \| Maximum \| Derivative Instrument 3
Derivative [Line Items]
Term	2014-12
Crude Oil Swap \| Maximum \| Derivative Instrument 4
Derivative [Line Items]
Term	2015-12
Crude Oil Swap \| Maximum \| Derivative Instrument 6
Derivative [Line Items]
Term	2015-12
Crude Oil Swap \| Maximum \| Derivative Instrument 7
Derivative [Line Items]
Term	2014-12
Deferred premium put [Member] \| Derivative Instrument 1
Derivative [Line Items]
Monthly Volumes Bbls	9,000
Price/bbl	85.00
Fair Value	39,681
Deferred premium put [Member] \| Minimum \| Derivative Instrument 1
Derivative [Line Items]
Term	2016-01
Deferred premium put [Member] \| Maximum \| Derivative Instrument 1
Derivative [Line Items]
Term	2016-06
Crude Oil Collar [Member] \| Derivative Instrument 5
Derivative [Line Items]
Monthly Volumes Bbls	1,900
Price/bbl	96.00
Fair Value	$ 33,003
Crude Oil Collar [Member] \| Minimum \| Derivative Instrument 5
Derivative [Line Items]
Term	2014-01
Crude Oil Collar [Member] \| Maximum \| Derivative Instrument 5
Derivative [Line Items]
Term	2014-12

- Definition

Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.

+ References+ Details