Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes (Textual) [Abstract]
State and local income taxes	$ 0.6	$ (0.2)	$ (0.1)
Foreign income tax payments (refunds)	13.1mtrn_ForeignIncomeTaxPaymentRefunds	8.2mtrn_ForeignIncomeTaxPaymentRefunds	13.2mtrn_ForeignIncomeTaxPaymentRefunds
Amount of unrecognized tax benefits	1.8mtrn_AmountOfUnrecognizedTaxBenefits
Effective tax rate if recognized	1.0
Undistributed foreign earnings	53.2mtrn_UndistributedForeignEarnings
Foreign Country [Member]
Operating Loss Carryforwards [Line Items]
Foreign net operating loss carryforwards, do not expire	6.5
Foreign net operating loss carryforwards	6.3
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Foreign net operating loss carryforwards	19.6
State tax credits, expire in calendar years 2012 through 2026	$ 2.6

Amount of unrecognized tax benefits.

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Foreign income tax payment refunds.

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Operating loss carryforwards subject to expiration.

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Undistributed foreign earnings.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of state and local current and deferred income tax expense (benefit) attributable to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 6.I.7)

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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