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Derivative Instruments - Schedule of Outstanding Commodity Derivative Instruments (Detail) $ in Thousands | Sep. 30, 2015 USD ($) MBbls $ / bbl
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Derivative [Line Items] |
Fair value asset (liability) | $ | $ 135,356
2015 Two-Way Collars [Member] |
Derivative [Line Items] |
Total notional amount of oil (barrels) | MBbls | 455
Average floor price (in dollars per barrel) | 86.00
Average ceiling price (in dollars per barrel) | 103.42
Fair value asset (liability) | $ | $ 18,790
2015 Swaps [Member] |
Derivative [Line Items] |
Total notional amount of oil (barrels) | MBbls | 2,093
Average swap price (in dollars per barrel) | 73.35
Fair value asset (liability) | $ | $ 57,933
2016 Two Way Collars [Member] |
Derivative [Line Items] |
Total notional amount of oil (barrels) | MBbls | 155
Average floor price (in dollars per barrel) | 86.00
Average ceiling price (in dollars per barrel) | 103.42
Fair value asset (liability) | $ | $ 6,133
2016 Swaps [Member] |
Derivative [Line Items] |
Total notional amount of oil (barrels) | MBbls | 5,643
Average swap price (in dollars per barrel) | 57.75
Fair value asset (liability) | $ | $ 51,499
2017 Swaps [Member] |
Derivative [Line Items] |
Total notional amount of oil (barrels) | MBbls | 372
Average swap price (in dollars per barrel) | 53.84
Fair value asset (liability) | $ | $ 1,001

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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 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 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 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 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 4: 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=49121117&loc=d3e13495-108611 + Details
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