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Derivative Instruments - Schedule of Outstanding Commodity Derivative Instruments (Detail) - Jun. 30, 2015
$ in Thousands
USD ($)
MBbls
$ / bbl
Derivative [Line Items]  
Fair Value Asset (Liability) | $ $ 109,819
2015 Two-Way Collars [Member]  
Derivative [Line Items]  
Total Notional Amount of Oil (Barrels) | MBbls 975
Average Floor Price (in dollars per barrel) 86.25
Average Ceiling Price (in dollars per barrel) 103.15
Fair Value Asset (Liability) | $ $ 25,462
2015 Swaps [Member]  
Derivative [Line Items]  
Total Notional Amount of Oil (Barrels) | MBbls 4,089
Average Swap Price (in dollars per barrel) 75.76
Fair Value Asset (Liability) | $ $ 63,667
2015 Deferred Premium Puts [Member]  
Derivative [Line Items]  
Total Notional Amount of Oil (Barrels) | MBbls 180
Average Floor Price (in dollars per barrel) 90.00
Average deferred premium (in dollars per barrel) 2.55
Fair Value Asset (Liability) | $ $ 5,201
2016 Two Way Collars [Member]  
Derivative [Line Items]  
Total Notional Amount of Oil (Barrels) | MBbls 155
Average Floor Price (in dollars per barrel) 86.00
Average Ceiling Price (in dollars per barrel) 103.42
Fair Value Asset (Liability) | $ $ 3,874
2016 Swaps [Member]  
Derivative [Line Items]  
Total Notional Amount of Oil (Barrels) | MBbls 2,628
Average Swap Price (in dollars per barrel) 66.08
Fair Value Asset (Liability) | $ $ 11,510
2017 Swaps [Member]  
Derivative [Line Items]  
Total Notional Amount of Oil (Barrels) | MBbls 93
Average Swap Price (in dollars per barrel) 63.94
Fair Value Asset (Liability) | $ $ 105