Quarterly report pursuant to Section 13 or 15(d)

Business & Basis of Presentation - Additional Information 1 (Details)

v2.4.1.9
Business & Basis of Presentation - Additional Information 1 (Details)
3 Months Ended
Mar. 31, 2015
segment
Line
Accounts Notes And Loans Receivable [Line Items]  
Number of satellite radio systems 2siri_NumberOfSatelliteRadioSystems
Number of reportable segments 1us-gaap_NumberOfReportableSegments
Minimum [Member]  
Accounts Notes And Loans Receivable [Line Items]  
Length of prepaid subscriptions, term 3 months
Maximum [Member]  
Accounts Notes And Loans Receivable [Line Items]  
Length of prepaid subscriptions, term 12 months