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Financial Instruments - Effect of Derivative Instruments on Condensed Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative assets	$ 3,516	$ 1,347
Derivative liabilities	880	1,425
Total derivative instruments	2,636	(78)
Other assets [Member] \| Derivatives designated as cash-flow hedging instruments [Member] \| Interest rate swap [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	329
Other assets [Member] \| Crude oil commodity contracts [Member] \| Derivatives not designated as cash-flow hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	2,363	118
Other assets [Member] \| Natural gas commodity contracts [Member] \| Derivatives not designated as cash-flow hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	50
Other current assets [Member] \| Crude oil commodity contracts [Member] \| Derivatives not designated as cash-flow hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	221	189
Other current assets [Member] \| Natural gas commodity contracts [Member] \| Derivatives not designated as cash-flow hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	553	1,040
Derivative liability short-term [Member] \| Derivatives designated as cash-flow hedging instruments [Member] \| Interest rate swap [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	(66)
Derivative liability short-term [Member] \| Crude oil commodity contracts [Member] \| Derivatives not designated as cash-flow hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	(814)	(994)
Derivative liability long-term [Member] \| Derivatives designated as cash-flow hedging instruments [Member] \| Interest rate swap [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities		(54)
Derivative liability long-term [Member] \| Crude oil commodity contracts [Member] \| Derivatives not designated as cash-flow hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities		$ (377)

Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against an obligation to return collateral under a master netting arrangement.

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- Definition

Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement.

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