Fair Value Measurements (Variable to Fixed Price Commodity Swaps Derivative Instruments) (Detail)	Sep. 30, 2015 USD ($)
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Crude oil contracts	$ 0
Marketable Securities	0
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Crude oil contracts	3,095,639
Marketable Securities	0
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Crude oil contracts	0
Marketable Securities	$ 210,990