Business & Basis of Presentation - Additional Information 1 (Details)	9 Months Ended
	Sep. 30, 2015 Line segment
Accounts Notes And Loans Receivable [Line Items]
Number of satellite radio systems | Line	2
Number of reportable segments	1
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