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Subsequent Events - Additional Information (Detail) (USD $) In Millions, unless otherwise specified |  | 6 Months Ended | 1 Months Ended
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Aug. 07, 2013 2014 swaps, sub-floors and two-way costless collar options [Member] Subsequent Event [Member] bbl | Aug. 07, 2013 Two Thousand Fifteen Three Way Collars, Swaps And Swaps With Sub Floors [Member] [Member] [Member] Subsequent Event [Member] bbl | Jun. 30, 2013 Drilling contracts [Member] | Jul. 31, 2013 Drilling contracts [Member] Subsequent Event [Member]
Subsequent Event [Line Items] |  |  |  |
Total notional amount of oil barrels | 1,879,000 | 124,000 |  |
Payments upon early contract termination |  |  | $ 30.2 | $ 4.8

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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 loss recognized on termination of a contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -SubTopic 275 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6471736&loc=d3e54681-109401 + Details
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