Benefits Plans  | 
9 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2011  | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Benefits Plans [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Benefits Plans | 
   
         (13) Benefits Plans
    
             We recognized share-based payment expense of $13,983 and $16,220 for the three months ended
   September 30, 2011 and 2010, respectively, and $36,006 and $47,443 for the nine months ended
   September 30, 2011 and 2010, respectively. We did not realize any income tax benefits from
   share-based benefits plans during the three and nine months ended September 30, 2011 and 2010 as a
   result of the full valuation allowance that is maintained for substantially all net deferred tax
   assets.
    
   
   
        2009 Long-Term Stock Incentive Plan
    
             In May 2009, our stockholders approved the Sirius XM Radio Inc. 2009 Long-Term Stock Incentive
   Plan (the “2009 Plan”). Employees, consultants and members of our board of directors are eligible
   to receive awards under the 2009 Plan. The 2009 Plan provides for the grant of stock options,
   restricted stock, restricted stock units and other stock-based awards that the compensation
   committee of our board of directors may deem appropriate. Vesting and other terms of stock-based
   awards are set forth in the agreements with the individuals receiving the awards. Stock-based
   awards granted under the 2009 Plan are generally subject to a vesting requirement. Stock-based
   awards generally expire ten years from the date of grant. Each restricted stock unit entitles the
   holder to receive one share of common stock upon vesting. As of September 30, 2011, approximately
   196,121,000 shares of common stock were available for future grants under the 2009 Plan.
    
        Other Plans
    
             We maintain four other share-based benefit plans — the XM 2007 Stock Incentive Plan, the
   Amended and Restated Sirius Satellite Radio 2003 Long-Term Stock Incentive Plan, the XM 1998 Shares
   Award Plan and the XM Talent Option Plan. No further awards may be made under these plans.
   Outstanding awards under these plans are being continued.
    
             The following table summarizes the weighted-average assumptions used to compute the fair value
   of options granted to employees and members of our board of directors:
    
   
           There were no options granted to third parties during the three and nine months ended
   September 30, 2011 and 2010.
    
        We estimate fair value of awards granted using the hybrid approach for volatility, which
   weights observable historical volatility and implied volatility of qualifying actively traded
   options on our common stock. In 2010, due to the lack of qualifying actively traded options on our
   common stock, we utilized a 100% weighting to observable historical volatility.
    
        The following table summarizes stock option activity under our share-based payment plans for
   the nine months ended September 30, 2011 (shares in thousands):
    
   
           The weighted average grant date fair value of options granted during the nine months
   ended September 30, 2011 and 2010 was $1.04 and $0.66, respectively. The total intrinsic value of
   stock options exercised during the nine months ended September 30, 2011 and 2010 was $10,011 and
   $5,611, respectively.
    
             We recognized share-based payment expense associated with stock options of $13,201 and $11,679
   for the three months ended September 30, 2011 and 2010, respectively, and $33,098 and $32,459 for
   the nine months ended September 30, 2011 and 2010, respectively.
    
   
   
             The following table summarizes the nonvested restricted stock and restricted stock unit
   activity under our share-based payment plans for the nine months ended September 30, 2011 (shares
   in thousands):
    
   
           There were no restricted stock awards or restricted stock units granted during the nine
   months ended September 30, 2011 and 2010. The total intrinsic value of restricted stock and
   restricted stock units that vested during the nine months ended September 30, 2011 and 2010 was
   $3,178 and $3,923, respectively.
    
             We recognized share-based payment expense associated with restricted stock units and shares of
   restricted stock of $0 and $1,385 for the three months ended September 30, 2011 and 2010,
   respectively, and $543 and $6,059 for the nine months ended September 30, 2011 and 2010,
   respectively.
    
             Total unrecognized compensation costs related to unvested share-based payment awards for stock
   options and restricted stock units and shares granted to employees and members of our board of
   directors at September 30, 2011 and December 31, 2010, net of estimated forfeitures, was $145,460
   and $108,170, respectively. The weighted-average period over which the compensation expense for
   these awards is expected to be recognized is three years as of September 30, 2011.
    
        401(k) Savings Plan
    
             We sponsor the Sirius XM Radio 401(k) Savings Plan (the “Sirius XM Plan”) for eligible
   employees.
    
             The Sirius XM Plan allows eligible employees to voluntarily contribute from 1% to 50% of their
   pre-tax eligible earnings, subject to certain defined limits. We match 50% of an employee’s
   voluntary contributions, up to 6% of an employee’s pre-tax salary, in the form of shares of common
   stock. Employer matching contributions under the Sirius XM Plan vest at a rate of 331/3% for each
   year of employment and are fully vested after three years of employment for all current and future
   contributions. Share-based payment expense resulting from the matching contribution to the Sirius
   XM Plan was $782 and $724 for the three months ended September 30, 2011 and 2010, respectively, and
   $2,365 and $2,649 for the nine months ended September 30, 2011 and 2010, respectively.
    
             We may also elect to contribute to the profit sharing portion of the Sirius XM Plan based upon
   the total eligible compensation of eligible participants. These additional contributions in the
   form of shares of common stock are determined by the compensation committee of our board of
   directors. Employees are only eligible to receive profit-sharing contributions during any year in
   which they are employed on the last day of the year. We currently do not anticipate contributing to
   the profit sharing portion of the Sirius XM Plan in 2011. Profit-sharing contribution expense was
   $0 and $2,432 for the three months ended September 30, 2011 and 2010, respectively, and $0 and
   $6,276 for the nine months ended September 30, 2011 and 2010, respectively.
    
   
   
    | 
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||