Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of Assets and Liabilities Measured at Fair Value (Details)

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Summary of Significant Accounting Policies - Summary of Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Liabilities:    
Debt, fair value [1] $ 5,419,038 $ 4,613,044
Level 1 [Member]    
Liabilities:    
Debt, fair value [1] 0 0
Level 2 [Member]    
Liabilities:    
Debt, fair value [1] 5,419,038 4,613,044
Level 3 [Member]    
Liabilities:    
Debt, fair value [1] 0 0
Sirius XM Canada [Member]    
Assets:    
Investment, fair value [2] 173,900 246,500
Sirius XM Canada [Member] | Level 1 [Member]    
Assets:    
Investment, fair value [2] 173,900 246,500
Sirius XM Canada [Member] | Level 2 [Member]    
Assets:    
Investment, fair value [2] 0 0
Sirius XM Canada [Member] | Level 3 [Member]    
Assets:    
Investment, fair value [2] $ 0 $ 0
[1] The fair value for non-publicly traded instruments is based upon estimates from a market maker and brokerage firm. Refer to Note 11 for information related to the carrying value of our debt as of September 30, 2015 and December 31, 2014.
[2] This amount approximates fair value. The carrying value of our investment in Sirius XM Canada was $0 and $2,654 as of September 30, 2015 and December 31, 2014, respectively.