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Summary of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail)	0 Months Ended
	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

X

- Definition

Inflation Rate for Property, Plant and Equipment, Fair Value Measurement

+ References

No definition available.

+ Details

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- Details

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X

- 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

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