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Related Party Transactions (Additional Information) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2013
Dec. 31, 2008
LoEn Entertainment, Inc        
Related Party Transaction [Line Items]        
Revenue from related party $ 26.4us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rnwk_LoEnEntertainmentIncMember		 $ 18.1us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rnwk_LoEnEntertainmentIncMember		    
Percentage of acquire outstanding shares of LoEn Entertainment, Inc.     9.00%rnwk_PercentageOfOwnershipInterestsAcquired
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rnwk_LoEnEntertainmentIncMember		 11.00%rnwk_PercentageOfOwnershipInterestsAcquired
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rnwk_LoEnEntertainmentIncMember
Rhapsody America LLC        
Related Party Transaction [Line Items]        
Revenue from related party $ 0.5us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember		 $ 0.8us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember