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Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Assets |  |
Derivative assets | $ 3,516 | $ 1,347
Liabilities |  |
Derivative liabilities | (880) | (1,425)
Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 3,516 | 1,347
Liabilities |  |
Derivative liabilities | (880) | (1,425)
Commodity derivative contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 3,188 | 1,347
Liabilities |  |
Derivative liabilities | (814) | (1,371)
Interest rate derivative contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 328 |
Liabilities |  |
Derivative liabilities | (66) | (54)
Quoted Prices in Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets |  |
Liabilities |  |
Derivative liabilities |  |
Quoted Prices in Active Markets For Identical Assets (Level 1) [Member] | Commodity derivative contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets |  |
Liabilities |  |
Derivative liabilities |  |
Quoted Prices in Active Markets For Identical Assets (Level 1) [Member] | Interest rate derivative contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets |  |
Liabilities |  |
Derivative liabilities |  |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets |  |
Liabilities |  |
Derivative liabilities |  |
Significant Other Observable Inputs (Level 2) [Member] | Commodity derivative contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets |  |
Liabilities |  |
Derivative liabilities |  |
Significant Other Observable Inputs (Level 2) [Member] | Interest rate derivative contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets |  |
Liabilities |  |
Derivative liabilities |  |
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 3,516 | 1,347
Liabilities |  |
Derivative liabilities | (880) | (1,425)
Significant Unobservable Inputs (Level 3) [Member] | Commodity derivative contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 3,188 | 1,347
Liabilities |  |
Derivative liabilities | (814) | (1,371)
Significant Unobservable Inputs (Level 3) [Member] | Interest rate derivative contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivative assets | 328 |
Liabilities |  |
Derivative liabilities | $ (66) | $ (54)

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