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Subsequent Events - Additional Information (Detail) (USD $) In Millions, unless otherwise specified			6 Months Ended	1 Months Ended
	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

X

- 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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X

- 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

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Balance Type:	debit
Period Type:	duration

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- Details

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