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Derivative Instruments - Summary of Gross and Net Information about Commodity Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Gross Amounts of Recognized Assets | $ 32,895 | $ 68,970
Derivative Assets, Gross Amounts Offset in the Balance Sheet | (29,116) | (44,973)
Net Amounts of Assets Presented in the Balance Sheet | 3,779 | 23,997
Gross Amounts of Recognized Liabilities | 47,028 | 46,401
Derivative Liabilities, Gross Amounts Offset in the Balance Sheet | (29,116) | (44,973)
Net Amounts of Liabilities Presented in the Balance Sheet | $ 17,912 | $ 1,428

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