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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)

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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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