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Goodwill (Goodwill by Segments and Acquisition) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2014
Dec. 31, 2012
Goodwill [Line Items]        
Goodwill $ 17,355us-gaap_Goodwill $ 17,476us-gaap_Goodwill   $ 6,309us-gaap_Goodwill
Goodwill acquired during period 460us-gaap_GoodwillAcquiredDuringPeriod 11,463us-gaap_GoodwillAcquiredDuringPeriod    
RealPlayer Group        
Goodwill [Line Items]        
Goodwill acquired during period     500us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= rnwk_RealplayerGroupMember		  
RealPlayer Group        
Goodwill [Line Items]        
Goodwill 985us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rnwk_RealplayerGroupMember		 580us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rnwk_RealplayerGroupMember		    
Mobile Entertainment        
Goodwill [Line Items]        
Goodwill 1,976us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rnwk_MobileEntertainmentMember		 2,119us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rnwk_MobileEntertainmentMember		    
Games        
Goodwill [Line Items]        
Goodwill $ 14,394us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rnwk_GamesMember		 $ 14,777us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rnwk_GamesMember