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Summary of Significant Accounting Policies (Changes in Allowance for Doubtful Accounts) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance at beginning of period $ 2,182us-gaap_AllowanceForDoubtfulAccountsReceivable $ 1,732us-gaap_AllowanceForDoubtfulAccountsReceivable $ 1,662us-gaap_AllowanceForDoubtfulAccountsReceivable
Charged to expense 95us-gaap_ProvisionForDoubtfulAccounts 580us-gaap_ProvisionForDoubtfulAccounts 116us-gaap_ProvisionForDoubtfulAccounts
Deductions (393)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (167)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (72)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Effect of foreign currency exchange rates (126)mrvc_AllowanceForDoubtfulAccountsForeignCurrencyTranslation 37mrvc_AllowanceForDoubtfulAccountsForeignCurrencyTranslation 26mrvc_AllowanceForDoubtfulAccountsForeignCurrencyTranslation
Balance at end of period $ 1,758us-gaap_AllowanceForDoubtfulAccountsReceivable $ 2,182us-gaap_AllowanceForDoubtfulAccountsReceivable $ 1,732us-gaap_AllowanceForDoubtfulAccountsReceivable
Network Integration segment [Member] | Telecom Italia S.p.A. [Member] | Credit Concentration Risk [Member] | Accounts Receivable [Member]      
Concentration Risk [Line Items]      
Percentage of Accounts Receivable (excceds percentage) 29.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember		 27.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember		 9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember
Network Integration segment [Member] | Fastweb S.p.A. [Member] | Credit Concentration Risk [Member] | Accounts Receivable [Member]      
Concentration Risk [Line Items]      
Percentage of Accounts Receivable (excceds percentage) 5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember		 22.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember		 20.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember