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Derivative Instruments - Schedule of Outstanding Commodity Derivative Instruments (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
MBbls
$ / bbl
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