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Financial Instruments - Effect of Derivative Instruments on Consolidated Statements of Operations (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended
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Jan. 31, 2014 | Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |
Swaps, settlement dates description |  | January 2015 through December 2015
Net proceeds from derivative instruments | $ 276 us-gaap_ProceedsFromDerivativeInstrumentFinancingActivities | $ 703 us-gaap_ProceedsFromDerivativeInstrumentFinancingActivities
Gains on settlement of derivative instruments |  | $ 979 us-gaap_GainLossOnSaleOfDerivatives
Crude Oil Commodity Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Swaps, settlement dates description |  | January 2016 through December 2016

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- Definition Description of the relevant terms of the derivative. Includes the type of instrument, risk being hedged, notional amount, counterparty, inception date, maturity date, relevant interest rates, strike price, cap price, and floor price. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Details
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Balance Type: | na
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- Definition The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The cash inflow provided by derivative instruments during the period, which are classified as financing activities, excluding those designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3505-108585 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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