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Rhapsody Joint Venture (Summarized Financial Operating Information for Rhapsody) (Detail) (Rhapsody America LLC, USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Rhapsody America LLC
    
Schedule of Equity Method Investments [Line Items]    
Net revenue $ 46,324us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember		 $ 42,003us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember
Gross profit 8,090us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember		 9,121us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember
Net loss $ (8,924)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember		 $ (1,630)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= rnwk_RhapsodyAmericaLimitedLiabilityCompanyMember