Accounts Receivable Factoring (Narrative) (Details) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)	Mar. 31, 2015 EUR (€)	Dec. 31, 2014 USD ($)
Receivables [Abstract]
Amount of factoring permitted per credit facility agreements	$ 16.3		€ 15.0
Accounts receivables sold	11.5			10.5
Receivables transferred to the factor	10.2	12.1
Proceeds from sale of accounts receivables	9.0	21.2
Outstanding balances on accounts receivable	10.0			10.4
Related losses on sale	$ 0.03	$ 0.04

Accounts Receivable Sold, Outstanding Balance

No definition available.

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Namespace Prefix:	mrvc_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Gain (Loss) on Sale of Pledged Assets, Not Separately Reported, Finance Receivables

+ References

No definition available.

+ Details

Name:	mrvc_GainLossOnSaleOfPledgedAssetsNotSeparatelyReportedFinanceReceivables
Namespace Prefix:	mrvc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line of Credit Facility, Covenants, Accounts Receivable Factoring, Amount Permitted

+ References

No definition available.

+ Details

Name:	mrvc_LineOfCreditFacilityCovenantsAccountsReceivableFactoringAmountPermitted
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Pledged Assets, Not Separately Reported, Finance Receivables, Transferred to Factor

+ References

No definition available.

+ Details

Name:	mrvc_PledgedAssetsNotSeparatelyReportedFinanceReceivablesTransferredtoFactor
Namespace Prefix:	mrvc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Proceeds from Sale of Pledged Assets, Not Separately Reported, Finance Receivables

+ References

No definition available.

+ Details

Name:	mrvc_ProceedsfromSaleofPledgedAssetsNotSeparatelyReportedFinanceReceivables
Namespace Prefix:	mrvc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The carrying amount, as of the date of the latest financial statement presented, of finance receivables which are owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 1A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=55761124&loc=SL6224234-111729

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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Period Type:	duration