Annual report pursuant to Section 13 and 15(d)

Benefit Plans - Sirius XM Holdings Inc. Deferred Compensation Plan (Details)

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Benefit Plans - Sirius XM Holdings Inc. Deferred Compensation Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Retirement Benefits [Abstract]      
Deferred compensation contributions $ 7,605 $ 7,628 $ 4,295
Fair value of investment assets related to deferred compensation plan 21,860 14,641  
Unrealized gains (losses) on investments $ 0 $ 0