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Significant Accounting Policies - Additional Information (Details) (USD $)
2 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Line Items]                        
Goodwill impairment                   $ 11,350,000us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss $ 44,257,000us-gaap_GoodwillImpairmentLoss
Securities excluded from computation of diluted earnings per share                   3,455,861us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 5,445,252us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 5,883,719us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Revenues 2,000,000us-gaap_Revenues 41,417,000us-gaap_Revenues 29,611,000us-gaap_Revenues 37,620,000us-gaap_Revenues 33,268,000us-gaap_Revenues 47,405,000us-gaap_Revenues 33,848,000us-gaap_Revenues 42,198,000us-gaap_Revenues 37,224,000us-gaap_Revenues 141,916,000us-gaap_Revenues 160,675,000us-gaap_Revenues 197,627,000us-gaap_Revenues
Other Deferred Revenue [Member]                        
Accounting Policies [Line Items]                        
Deferred revenue increase (decrease) 8,000,000us-gaap_DeferredRevenuePeriodIncreaseDecrease
/ us-gaap_BalanceSheetLocationAxis
= mso_OtherDeferredRevenueMember
                     
Deferred Subscription Revenue [Member]                        
Accounting Policies [Line Items]                        
Deferred revenue increase (decrease) (8,000,000)us-gaap_DeferredRevenuePeriodIncreaseDecrease
/ us-gaap_BalanceSheetLocationAxis
= mso_DeferredSubscriptionRevenueMember
                     
Martha Stewart Living [Member]                        
Accounting Policies [Line Items]                        
Revenues                   $ 6,300,000us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= mso_MarthaStewartLivingMember