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Financial Instruments - Effect of Derivative Instruments on Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative assets	$ 1,423	$ 1,347
Derivative liabilities	(2,288)	(1,425)
Total derivative instruments	(865)	(78)
Other Assets [Member] | Interest Rate Swap [Member] | Derivatives Designated as Cash-Flow Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	86
Other Assets [Member] | Crude Oil Commodity Contracts [Member] | Derivatives Not Designated as Cash-Flow Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	980	118
Derivative Contracts [Member] | Crude Oil Commodity Contracts [Member] | Derivatives Not Designated as Cash-Flow Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	307	189
Derivative Contracts [Member] | Natural Gas Commodity Contracts [Member] | Derivatives Not Designated as Cash-Flow Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	50	1,040
Derivative Liability Short-Term [Member] | Interest Rate Swap [Member] | Derivatives Designated as Cash-Flow Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	(209)
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	(1,667)	(994)
Derivative Liability Short-Term [Member] | Natural Gas Commodity Contracts [Member] | Derivatives Not Designated as Cash-Flow Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	(318)
Derivative Liability Long-Term [Member] | Interest Rate Swap [Member] | Derivatives Designated as Cash-Flow Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	(69)	(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	$ (25)	$ (377)

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

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-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226011-175313



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226006-175313

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X

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226011-175313



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-Publisher FASB

-Name Accounting Standards Codification

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X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611



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-Publisher FASB

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-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958



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-Publisher FASB

-Name Accounting Standards Codification

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