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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

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