Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Details)

v3.8.0.1
Commitments and Contingencies - Additional Information (Details)
 1 Months Ended 3 Months Ended
Dec. 12, 2017
Mar. 03, 2017
USD ($)
Aug. 31, 2013
USD ($)
Mar. 31, 2018
USD ($)
satellite
Loss Contingencies [Line Items]        
Number of replacement satellites | satellite       2
Sound Exchange, Inc | Pending Litigation        
Loss Contingencies [Line Items]        
Underpayment of royalty payment (exceeds) 10.00%      
Telephone Consumer Protection Act Suits | Pending Litigation        
Loss Contingencies [Line Items]        
Damages sought per violation   $ 500    
Surety Bond        
Loss Contingencies [Line Items]        
Estimate of possible loss       $ 45,000,000
Maximum        
Loss Contingencies [Line Items]        
Operating lease obligations, term       15 years
Maximum | Sound Exchange, Inc | Pending Litigation        
Loss Contingencies [Line Items]        
Compensatory damages sought     $ 100,000,000  
Maximum | Telephone Consumer Protection Act Suits | Pending Litigation        
Loss Contingencies [Line Items]        
Damages sought per willful violation   $ 1,500    
Minimum        
Loss Contingencies [Line Items]        
Operating lease obligations, term       1 year
Minimum | Sound Exchange, Inc | Pending Litigation        
Loss Contingencies [Line Items]        
Compensatory damages sought     $ 50,000,000  
XM-5, FM-5, FM-6, XM-3, and XM-4        
Loss Contingencies [Line Items]        
Operating performance over design life       15 years
XM-4        
Loss Contingencies [Line Items]        
Period beyond expected operating performance of design life for XM-4       5 years
XM-4 | Maximum        
Loss Contingencies [Line Items]        
Additional payments required if XM-4 continues to operate above baseline specifications       $ 10,000,000