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Subsequent Events (Narrative) (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 1 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 Unsecured Senior Notes [Member] | Jul. 02, 2012 Subsequent Event [Member] Unsecured Senior Notes [Member] | Jul. 31, 2012 Subsequent Event [Member] 2012 Two-Way And Three-Way Collars [Member] bbl | Jul. 31, 2012 Subsequent Event [Member] 2013 Two-Way And Three-Way Collars [Member] bbl | Jul. 31, 2012 Subsequent Event [Member] 2014 Two-Way And Three-Way Collars [Member] bbl
Subsequent Event [Line Items] |  |  |  |  |
Senior unsecured debt principal amount |  | $ 400.0 |  |  |
Senior unsecured notes stated interest rate |  | 6.875% |  |  |
Senior unsecured notes payment frequency | Semi-annually | Semi-annually |  |  |
Net proceeds from issuance of notes | $ 783.4 | $ 392.0 |  |  |
Debt instrument, maturity date |  | Jan. 15, 2023 |  |  |
Total notional amount, in barrels |  |  | 183,000 | 1,215,500 | 108,500

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