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Stockholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
1 Months Ended 12 Months Ended
Dec. 21, 2012
May 25, 2012
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Preferred stock, shares authorized       1,000,000us-gaap_PreferredStockSharesAuthorized 1,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, par value       0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Dividend, common stock declared and staggered cash payment for loss on fair value of options $ 10,600us-gaap_DividendsCommonStockCash $ 47,300us-gaap_DividendsCommonStockCash $ 57,957us-gaap_DividendsCommonStockCash    
Dividend, common stock declared and stock option holder payment, per share $ 1.40us-gaap_CommonStockDividendsPerShareDeclared $ 6.00us-gaap_CommonStockDividendsPerShareDeclared      
Percentage of stock option payment paid immediately   50.00%mrvc_StaggeredCashPaymentForLossOnFairValueOfOptionsPercentPaidImmediately      
Percentage of dividend paid in 12 months   50.00%mrvc_StaggeredCashPaymentForLossOnFairValueOfOptionsPaidInTwelveMonths      
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based payment award, expiration period       10 years  
Share-based payment award, number of shares available for grant       103,914us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Stock Options [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based payment award, vesting period       1 year  
Stock Options [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based payment award, vesting period       4 years  
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based payment award, vesting period       1 year