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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)

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- 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 -SubTopic 10 -Section 50 -Paragraph 8 -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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226006-175313 + Details
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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. + 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 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226006-175313 + Details
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- 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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