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Derivative Instruments - Schedule of Outstanding Commodity Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013
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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

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The average strike price of the sold put that establishes the price at which if the market price falls below, the minimum price would be index price plus the difference between the purchased put (floor) and the sold put strike price. + References No definition available. + Details
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- Definition The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract. + References No definition available. + Details
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- Definition The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract. + References No definition available. + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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- Definition Average fixed price related to the group of price risk swap derivatives. + References No definition available. + Details
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