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Subsequent Events - Additional Information (Detail) (USD $) In Millions, unless otherwise specified |  | 3 Months Ended |  | 1 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2014 Drilling contracts [Member] | May 07, 2014 Subsequent Event [Member] | May 07, 2014 Subsequent Event [Member] Drilling contracts [Member] | Apr. 30, 2014 Two Thousand Fifteen Swap Agreement [Member] Subsequent Event [Member] bbl
Subsequent Event [Line Items] |  |  |  |  |
Total rental commitments under leases | $ 10.4 |  | $ 27.6 |  |
Payments upon early contract termination |  | $ 19.8 |  | $ 21.9 |
Total Notional Amount of Oil (Barrels) |  |  |  |  | 1,092,000

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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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