Annual report pursuant to Section 13 and 15(d)

Benefit Plans - 401(k) Savings Plan (Details)

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Benefit Plans - 401(k) Savings Plan (Details) - Sirius XM Savings Plan - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Minimum of employee contributions of pre-tax eligible earnings to Company 401(k) Savings Plan 1.00%    
Maximum of employee contributions of pre-tax eligible earnings to Company 401(k) Savings Plan 50.00%    
Percent of Company match of employee's voluntary contributions 50.00%    
Percent of employee's pre-tax salary 6.00%    
Maximum annual contributions per employee, percent 3.00%    
Vesting percentage of employer contributions for each year of employment 33.33%    
Savings plan, fully vested period 3 years    
Recognized cost $ 8,692 $ 7,582 $ 7,104