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Derivative Instruments - Schedule of Outstanding Commodity Derivative Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Fair Value Asset (Liability) $ 17,616
2013 Two-Way Collars [Member]
  
Settlement Period 2013
Total Notional Amount of Oil (Barrels) 1,006,500
Average Floor Price (in dollars per barrel) 86.82
Average Ceiling Price (in dollars per barrel) 97.75
Fair Value Asset (Liability) (985)
2013 Three-Way Collars [Member]
  
Settlement Period 2013
Total Notional Amount of Oil (Barrels) 1,121,790
Average Sub-Floor Price (in dollars per barrel) 65.92
Average Floor Price (in dollars per barrel) 92.45
Average Ceiling Price (in dollars per barrel) 111.45
Fair Value Asset (Liability) 1,898
2013 Put Spreads [Member]
  
Settlement Period 2013
Total Notional Amount of Oil (Barrels) 906,210
Average Sub-Floor Price (in dollars per barrel) 70.93
Average Floor Price (in dollars per barrel) 91.09
Fair Value Asset (Liability) 1,364
2013 Swaps [Member]
  
Settlement Period 2013
Total Notional Amount of Oil (Barrels) 1,464,000
Average Swap Price (in dollars per barrel) 95.40
Fair Value Asset (Liability) (255)
2014 Two-Way Collars [Member]
  
Settlement Period 2014
Total Notional Amount of Oil (Barrels) 504,500
Average Floor Price (in dollars per barrel) 88.92
Average Ceiling Price (in dollars per barrel) 95.86
Fair Value Asset (Liability) 682
2014 Three-Way Collars [Member]
  
Settlement Period 2014
Total Notional Amount of Oil (Barrels) 2,695,030
Average Sub-Floor Price (in dollars per barrel) 70.33
Average Floor Price (in dollars per barrel) 90.79
Average Ceiling Price (in dollars per barrel) 106.21
Fair Value Asset (Liability) 9,870
2014 Put Spreads [Member]
  
Settlement Period 2014
Total Notional Amount of Oil (Barrels) 150,970
Average Sub-Floor Price (in dollars per barrel) 71.03
Average Floor Price (in dollars per barrel) 91.03
Fair Value Asset (Liability) 576
2014 Swaps [Member]
  
Settlement Period 2014
Total Notional Amount of Oil (Barrels) 1,083,000
Average Swap Price (in dollars per barrel) 93.04
Fair Value Asset (Liability) 2,290
2014 Swaps with sub-floors [Member]
  
Settlement Period 2014
Total Notional Amount of Oil (Barrels) 1,336,000
Average Swap Price (in dollars per barrel) 92.03
Average Sub-Floor Price (in dollars per barrel) 70.00
Fair Value Asset (Liability) 318
2015 Two-Way Collars [Member]
  
Settlement Period 2015
Total Notional Amount of Oil (Barrels) 31,000
Average Floor Price (in dollars per barrel) 90.00
Average Ceiling Price (in dollars per barrel) 94.90
Fair Value Asset (Liability) 137
2015 Three-Way Collars [Member]
  
Settlement Period 2015
Total Notional Amount of Oil (Barrels) 232,500
Average Sub-Floor Price (in dollars per barrel) 70.67
Average Floor Price (in dollars per barrel) 90.67
Average Ceiling Price (in dollars per barrel) 105.81
Fair Value Asset (Liability) 1,114
2015 Swaps [Member]
  
Settlement Period 2015
Total Notional Amount of Oil (Barrels) 77,500
Average Swap Price (in dollars per barrel) 92.34
Fair Value Asset (Liability) 363
2015 Swaps with sub-floors [Member]
  
Settlement Period 2015
Total Notional Amount of Oil (Barrels) 124,000
Average Swap Price (in dollars per barrel) 92.03
Average Sub-Floor Price (in dollars per barrel) 70.00
Fair Value Asset (Liability) $ 244