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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
Jun. 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 581 470
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl 728 197
Oil/Natural Gas Derivative Assets, Estimated Fair Value $ 6,855 $ 14,357
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value $ (1,652) $ (1,670)
Financial Institution Counterparties [Member] | Natural Gas Commodity Derivative [Member]    
Derivative Instruments [Line Items]    
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU 7,892 12,235
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU 7,992 16,755
Oil/Natural Gas Derivative Assets, Estimated Fair Value $ 7,141 $ 12,707
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value $ (1,886) $ (4,095)
Customer Counterparties [Member] | Oil Commodity Derivative [Member]    
Derivative Instruments [Line Items]    
Oil/Natural Gas Derivative Assets, Notional Amount | bbl 728 197
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl 581 470
Oil/Natural Gas Derivative Assets, Estimated Fair Value $ 1,673 $ 1,670
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value $ (6,847) $ (14,318)
Customer Counterparties [Member] | Natural Gas Commodity Derivative [Member]    
Derivative Instruments [Line Items]    
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU 7,992 16,755
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU 7,892 12,235
Oil/Natural Gas Derivative Assets, Estimated Fair Value $ 1,886 $ 4,095
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value $ (7,081) $ (12,646)