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Derivative Instruments - Schedule of Outstanding Commodity Derivative Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
bbl
Derivative [Line Items]  
Fair Value Asset (Liability) $ (74,259)
2014 Two-Way Collars [Member]
  
Derivative [Line Items]  
Settlement Period 2014
Total Notional Amount of Oil (Barrels) 1,855,500
Average Floor Price (in dollars per barrel) 94.92
Average Ceiling Price (in dollars per barrel) 106.16
Fair Value Asset (Liability) (3,019)
2014 Three-Way Collars [Member]
  
Derivative [Line Items]  
Settlement Period 2014
Total Notional Amount of Oil (Barrels) 1,615,500
Average Sub-Floor Price (in dollars per barrel) 70.57
Average Floor Price (in dollars per barrel) 90.57
Average Ceiling Price (in dollars per barrel) 105.20
Fair Value Asset (Liability) (3,774)
2014 Swaps [Member]
  
Derivative [Line Items]  
Settlement Period 2014
Total Notional Amount of Oil (Barrels) 1,858,500
Average Swap Price (in dollars per barrel) 96.13
Fair Value Asset (Liability) (14,339)
2014 Swaps with sub-floors [Member]
  
Derivative [Line Items]  
Settlement Period 2014
Total Notional Amount of Oil (Barrels) 1,098,000
Average Swap Price (in dollars per barrel) 92.60
Average Sub-Floor Price (in dollars per barrel) 70.00
Fair Value Asset (Liability) (12,194)
2015 Two-Way Collars [Member]
  
Derivative [Line Items]  
Settlement Period 2015
Total Notional Amount of Oil (Barrels) 2,388,500
Average Floor Price (in dollars per barrel) 87.98
Average Ceiling Price (in dollars per barrel) 103.21
Fair Value Asset (Liability) (2,738)
2015 Three-Way Collars [Member]
  
Derivative [Line Items]  
Settlement Period 2015
Total Notional Amount of Oil (Barrels) 263,500
Average Sub-Floor Price (in dollars per barrel) 70.59
Average Floor Price (in dollars per barrel) 90.59
Average Ceiling Price (in dollars per barrel) 105.25
Fair Value Asset (Liability) (489)
2015 Swaps [Member]
  
Derivative [Line Items]  
Settlement Period 2015
Total Notional Amount of Oil (Barrels) 5,263,500
Average Swap Price (in dollars per barrel) 90.81
Fair Value Asset (Liability) (34,657)
2015 Swaps with sub-floors [Member]
  
Derivative [Line Items]  
Settlement Period 2015
Total Notional Amount of Oil (Barrels) 186,000
Average Swap Price (in dollars per barrel) 92.60
Average Sub-Floor Price (in dollars per barrel) 70.00
Fair Value Asset (Liability) (1,544)
2015 Deferred Premium Puts [Member]
  
Derivative [Line Items]  
Settlement Period 2015
Total Notional Amount of Oil (Barrels) 1,086,000
Average Floor Price (in dollars per barrel) 90.00
DerivativeAverageDeferredPremium 2.55
Fair Value Asset (Liability) (549)
2016 Two Way Collars [Member]
  
Derivative [Line Items]  
Settlement Period 2016
Total Notional Amount of Oil (Barrels) 155,000
Average Floor Price (in dollars per barrel) 86.00
Average Ceiling Price (in dollars per barrel) 103.42
Fair Value Asset (Liability) 92
2016 Swaps [Member]
  
Derivative [Line Items]  
Settlement Period 2016
Total Notional Amount of Oil (Barrels) 310,000
Average Swap Price (in dollars per barrel) 90.15
Fair Value Asset (Liability) $ (1,048)