| 
           Business & Basis of Presentation (Details) 
         | 
        9 Months Ended | 
|---|---|
| 
           Sep. 30, 2014
 
          Line 
         | 
      |
| Organization, Consolidation and Presentation of Financial Statements [Abstract] | |
| Number of satellite radio systems | 2 | 
| 
           Minimum [Member] 
         | 
        |
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |
| Length of prepaid subscriptions, term | 3 months | 
| 
           Maximum [Member] 
         | 
        |
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |
| Length of prepaid subscriptions, term | 12 months | 
| X | ||||||||||
| 
             
- Definition 
          Length of Prepaid Subscriptions, Term No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Number of Satellite radio systems. No definition available. 
  | 
        
| X | ||||||||||
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- Details 
          
  | 
        
| X | ||||||||||
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- Details 
          
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