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v2.4.1.9

Summary of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) | 0 Months Ended |
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Feb. 26, 2013 | Feb. 26, 2013
Business Acquisition [Line Items] |  |
Risk adjusted discount rate | 10.00%us-gaap_FairValueInputsDiscountRate |
Inflation rate |  | 2.00%imo_InflationRateForPropertyPlantAndEquipmentFairValueMeasurement

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- Definition Inflation Rate for Property, Plant and Equipment, Fair Value Measurement + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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