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Related Party Transactions - Additional Information (Detail) (USD $)
1 Months Ended 7 Months Ended 9 Months Ended
Jul. 31, 2013
Nov. 07, 2013
Nov. 07, 2013
Dec. 31, 2013
Dec. 31, 2014
Aug. 31, 2012
Mar. 02, 2010
Apr. 01, 2013
Jul. 09, 2014
Mar. 31, 2014
Nov. 06, 2013
Related Party Transaction [Line Items]                      
Extraordinary dividend declared             $ 1.10msn_ExtraordinaryDividendDeclared        
Company's assertion as to the percent of the dividend that is taxable to the recipient             4.90%msn_PercentageOfDividendTaxable        
Internal Revenue Service's assertion as to the percent of the dividend that is taxable to the recipient, which the company is refuting           100.00%msn_PercentageOfDividendTaxableInternalRevenueService          
Restricted cash         $ 500,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue            
Estimated additional taxes, penalties and interest         4,800,000msn_EstimatedAdditionalTaxesPenaltiesAndInterest            
Lafe Strategic Services Limited                      
Related Party Transaction [Line Items]                      
Security deposit returned 6,000us-gaap_IncreaseDecreaseInSecurityDeposits
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_LafeStrategicServicesLimitedMember
                   
Amount receivable from related party               0us-gaap_AccountsReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_LafeStrategicServicesLimitedMember
     
Grande                      
Related Party Transaction [Line Items]                      
Grande's (Provisional Liquidator Appointed) Ownership Interest in Emerson number of shares                 15,243,283msn_OwnershipInterestNumberOfShares
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_GrandeMember
   
Grande's (Provisional Liquidator Appointed) Ownership Interest Percentage                 56.20%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_GrandeMember
   
Mr. Eduard Will, a director of Emerson                      
Related Party Transaction [Line Items]                      
Amount owed to related party   0us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_MrEduardWillDirectorOfEmersonMember
0us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_MrEduardWillDirectorOfEmersonMember
               
Consulting fees paid to related party   10,000us-gaap_ProfessionalFees
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_MrEduardWillDirectorOfEmersonMember
68,000us-gaap_ProfessionalFees
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_MrEduardWillDirectorOfEmersonMember
               
Travel advance paid to related party   6,000msn_TravelAdvancesPaid
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_MrEduardWillDirectorOfEmersonMember
6,000msn_TravelAdvancesPaid
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_MrEduardWillDirectorOfEmersonMember
               
Amount owed from Emerson to Brighton Marketing Limited                      
Related Party Transaction [Line Items]                      
Service charge from related party       1,000us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_BrightonMarketingLimitedMember
             
Amount owed to related party       0us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_BrightonMarketingLimitedMember
          0us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_BrightonMarketingLimitedMember
 
Grande Properties Management Limited                      
Related Party Transaction [Line Items]                      
Service charge from related party   3,000us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_RelatedPartyOneMember
11,000us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_RelatedPartyOneMember
               
Amount owed to related party                     0us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_RelatedPartyOneMember
Vigers Appraisal & Consulting Ltd                      
Related Party Transaction [Line Items]                      
Amount receivable from related party   0us-gaap_AccountsReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_VigersAppraisalConsultingLtdMember
0us-gaap_AccountsReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_VigersAppraisalConsultingLtdMember
               
Amount invoiced to related party   $ 1,000us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_VigersAppraisalConsultingLtdMember
$ 3,000us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= msn_VigersAppraisalConsultingLtdMember