| 
           Related Party Transactions (Details Textual 2) (USD $) 
         | 
        3 Months Ended | 9 Months Ended | 9 Months Ended | 12 Months Ended | 0 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | |||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 
           Sep. 30, 2014 
         | 
        
           Sep. 30, 2013 
         | 
        
           Sep. 30, 2014 
         | 
        
           Sep. 30, 2013 
         | 
        
           Sep. 30, 2014
 
          7% Exchangeable Senior Subordinated Notes due 2014 [Member] 
         | 
        
           Dec. 31, 2013
 
          7% Exchangeable Senior Subordinated Notes due 2014 [Member] 
         | 
        
           Sep. 30, 2013
 
          7% Exchangeable Senior Subordinated Notes due 2014 [Member] 
         | 
        
           Sep. 30, 2014
 
          Common Stock [Member] 
         | 
        
           Sep. 30, 2014
 
          Liberty Media [Member] 
         | 
        
           Sep. 30, 2014
 
          Liberty Media [Member]
 
          7% Exchangeable Senior Subordinated Notes due 2014 [Member] 
         | 
        
           Dec. 31, 2013
 
          Liberty Media [Member]
 
          7% Exchangeable Senior Subordinated Notes due 2014 [Member] 
         | 
        
           Sep. 30, 2014
 
          Liberty Media [Member]
 
          Related Party Current Liabilities [Member] 
         | 
        
           Dec. 31, 2013
 
          Liberty Media [Member]
 
          Related Party Current Liabilities [Member] 
         | 
        
           Sep. 30, 2014
 
          Liberty Media [Member]
 
          Related Party Current Liabilities [Member]
 
          Level 2 [Member] 
         | 
        
           Dec. 31, 2013
 
          Liberty Media [Member]
 
          Related Party Current Liabilities [Member]
 
          Level 2 [Member] 
         | 
        
           Dec. 31, 2013
 
          Liberty Media [Member]
 
          Common Stock [Member]
 
          October 2013 Share Repurchase Program [Member] 
         | 
        
           Apr. 25, 2014
 
          Liberty Media [Member]
 
          Common Stock [Member]
 
          October 2013 Share Repurchase Program [Member] 
         | 
        
           Oct. 09, 2013
 
          Liberty Media [Member]
 
          Common Stock [Member]
 
          October 2013 Share Repurchase Program [Member] 
         | 
        
           Apr. 25, 2014
 
          Liberty Media [Member]
 
          Common Stock [Member]
 
          Amended October 2013 Share Repurchase Program [Member] 
         | 
        
           Sep. 30, 2013
 
          Liberty Media [Member]
 
          Common Stock [Member]
 
          Amended October 2013 Share Repurchase Program [Member] 
         | 
        
           Sep. 30, 2014
 
          Sirius XM Canada [Member] 
         | 
        
           Sep. 30, 2013
 
          Sirius XM Canada [Member] 
         | 
        
           Sep. 30, 2014
 
          Sirius XM Canada [Member] 
         | 
        
           Sep. 30, 2013
 
          Sirius XM Canada [Member] 
         | 
        
           Dec. 31, 2013
 
          Sirius XM Canada [Member] 
         | 
        
           Jul. 31, 2008
 
          Sirius XM Canada [Member] 
         | 
      ||||||||||||||||
| Related Party Transaction [Line Items] | |||||||||||||||||||||||||||||||||||||||||
| Stock repurchase program, authorized amount | $ 500,000,000 | ||||||||||||||||||||||||||||||||||||||||
| Stock repurchased and retired during period, value | 160,000,000 | 340,000,000 | |||||||||||||||||||||||||||||||||||||||
| Derivatives asset (liability), fair value | 0 | [1] | (15,702,000) | [1] | 0 | [1] | (15,702,000) | [1] | |||||||||||||||||||||||||||||||||
| Stock repurchased and retired during period, value | 1,955,826,000 | 2,006,013,000 | 340,000,000 | [2] | |||||||||||||||||||||||||||||||||||||
| Share price (in dollars per share) | $ 3.66 | ||||||||||||||||||||||||||||||||||||||||
| Loss on change in value of derivatives | 0 | 0 | 34,485,000 | 0 | 34,485,000 | ||||||||||||||||||||||||||||||||||||
| 7% Exchangeable Senior Subordinated Notes due 2014 | 502,364,000 | [3],[4] | 11,000,000 | 11,000,000 | |||||||||||||||||||||||||||||||||||||
| Investment balance, carrying value | 1,292,000 | 1,292,000 | 26,972,000 | ||||||||||||||||||||||||||||||||||||||
| Investment, equity method goodwill and intangible assets | 1,292,000 | 1,292,000 | 26,161,000 | ||||||||||||||||||||||||||||||||||||||
| Related party deferred revenue, current | 2,776,000 | 2,776,000 | 2,776,000 | ||||||||||||||||||||||||||||||||||||||
| Related party deferred revenue, non current | 14,109,000 | 14,109,000 | 16,190,000 | ||||||||||||||||||||||||||||||||||||||
| Estimated fair value of deferred revenue from XM Canada | 34,000,000 | ||||||||||||||||||||||||||||||||||||||||
| Interest rate on instrument | 7.00% | [3],[4] | 7.00% | [3],[4] | 7.00% | 7.00% | 7.00% | ||||||||||||||||||||||||||||||||||
| Dividend received from unconsolidated entity investment | $ 12,873,000 | $ 17,707,000 | $ 4,591,000 | $ 4,727,000 | $ 39,046,000 | $ 12,209,000 | |||||||||||||||||||||||||||||||||||
          
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