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Derivative Financial Instruments - Schedule of Notional Amounts and Estimated Fair Values of Commodity Derivative Positions (Detail)
bbl in Thousands, MMBTU in Thousands, $ in Thousands
Sep. 30, 2015
USD ($)
MMBTU
bbl
Dec. 31, 2014
USD ($)
MMBTU
bbl
Financial Institution Counterparties [Member] | Oil Commodity Derivative [Member]    
Derivative Instruments [Line Items]    
Oil/Natural Gas Derivative Assets, Notional Amount | bbl 513 470
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl 363 197
Oil/Natural Gas Derivative Assets, Estimated Fair Value $ 10,110 $ 14,357
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value $ (811) $ (1,670)
Financial Institution Counterparties [Member] | Natural Gas Commodity Derivative [Member]    
Derivative Instruments [Line Items]    
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU 4,366 12,235
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU 3,996 16,755
Oil/Natural Gas Derivative Assets, Estimated Fair Value $ 5,029 $ 12,707
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value $ (1,420) $ (4,095)
Customer Counterparties [Member] | Oil Commodity Derivative [Member]    
Derivative Instruments [Line Items]    
Oil/Natural Gas Derivative Assets, Notional Amount | bbl 363 197
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl 513 470
Oil/Natural Gas Derivative Assets, Estimated Fair Value $ 811 $ 1,670
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value $ (10,090) $ (14,318)
Customer Counterparties [Member] | Natural Gas Commodity Derivative [Member]    
Derivative Instruments [Line Items]    
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU 3,996 16,755
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU 4,366 12,235
Oil/Natural Gas Derivative Assets, Estimated Fair Value $ 1,420 $ 4,095
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value $ (4,993) $ (12,646)