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Derivative Instruments - Schedule of Outstanding Commodity Derivative Instruments (Detail) $ in Thousands | Dec. 31, 2015 USD ($) MBbls $ / bbl
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Derivative [Line Items] |
Fair value asset (liability) | $ | $ 155,473
2016 Two way collars |
Derivative [Line Items] |
Total notional amount of oil barrels (in MBbls) | MBbls | 155
Average floor price (in dollars per barrel) | $ / bbl | 86.00
Average ceiling price (in dollars per barrel) | $ / bbl | 103.42
Fair value asset (liability) | $ | $ 7,464
2016 Swaps |
Derivative [Line Items] |
Total notional amount of oil barrels (in MBbls) | MBbls | 9,452
Average swap price (in dollars per barrel) | $ / bbl | 54.89
Fair value asset (liability) | $ | $ 132,233
2017 Swaps |
Derivative [Line Items] |
Total notional amount of oil barrels (in MBbls) | MBbls | 2,049
Average swap price (in dollars per barrel) | $ / bbl | 53.17
Fair value asset (liability) | $ | $ 15,109
2018 Swaps |
Derivative [Line Items] |
Total notional amount of oil barrels (in MBbls) | MBbls | 124
Average swap price (in dollars per barrel) | $ / bbl | 53.62
Fair value asset (liability) | $ | $ 667

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