Summary of Significant Accounting Policies (Details)	Sep. 30, 2014 USD ($)		Dec. 31, 2013 USD ($)		Sep. 30, 2014 Level 2 [Member] USD ($)		Dec. 31, 2013 Level 2 [Member] USD ($)		Sep. 30, 2014 Sirius XM Canada [Member] USD ($)		Dec. 31, 2013 Sirius XM Canada [Member] USD ($)		Sep. 30, 2014 Sirius XM Canada [Member] Level 1 [Member] USD ($)		Dec. 31, 2013 Sirius XM Canada [Member] Level 1 [Member] USD ($)		Sep. 30, 2014 Sirius XM Canada [Member] Level 3 [Member] USD ($)		Dec. 31, 2013 Sirius XM Canada [Member] Level 3 [Member] USD ($)		Sep. 30, 2014 Related Party Current Liabilities [Member] Liberty Media [Member] USD ($)		Dec. 31, 2013 Related Party Current Liabilities [Member] Liberty Media [Member] USD ($)		Sep. 30, 2014 Related Party Current Liabilities [Member] Liberty Media [Member] Level 2 [Member] USD ($)		Dec. 31, 2013 Related Party Current Liabilities [Member] Liberty Media [Member] Level 2 [Member] USD ($)		Dec. 31, 2013 8% Convertible Unsecured Subordinated Debentures [Member] Sirius XM Canada [Member] CAD
Assets
Investment balance, fair value									$ 303,500,000	[1]	$ 432,200,000	[1]	$ 303,500,000	[1]	$ 432,200,000	[1]
Fair value of host contract of debenture									0	[2]	3,641,000	[2]					0	[2]	3,641,000	[2]
Fair Value of Embedded Derivative Related to Investment in Debenture, Current									0	[2]	57,000	[2]					0	[2]	57,000	[2]
Liabilities
Debt, fair value	5,270,623,000	[3]	4,066,755,000	[3]	5,270,623,000	[3]	4,066,755,000	[3]
Derivatives asset (liability), fair value																					0	[4]	15,702,000	[4]	0	[4]	15,702,000	[4]
Investment balance, carrying value									1,292,000		26,972,000
Investment in related party debt																													4,000,000
Interest rate on instrument																													8.00%

[1] This amount approximates fair value. The carrying value of our investment in Sirius XM Canada was $1,292 and $26,972 as of September 30, 2014 and December 31, 2013, respectively.

[2] As of December 31, 2013, we held an investment in CAD $4,000 face value of 8% convertible unsecured subordinated debentures issued by Sirius XM Canada for which the embedded conversion feature was bifurcated from the host contract. Sirius XM Canada redeemed and converted the debentures during the three months ended March 31, 2014.

[3] The fair value for non-publicly traded instruments is based upon estimates from a market maker and brokerage firm. Refer to Note 13 for information related to the carrying value of our debt as of September 30, 2014 and December 31, 2013.

[4] The final installment under the share repurchase agreement with Liberty Media was settled on April 25, 2014. The fair value of the derivative associated with the share repurchase agreement was determined using observable inputs, including the U.S. spot LIBOR curve and other available market data and was recorded in our unaudited consolidated balance sheets in Related party current liabilities, with changes in fair value recorded to our unaudited statements of comprehensive income