Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Details)

v2.4.1.9
Subsequent Events - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Apr. 24, 2015
Subsequent Event [Line Items]      
Number of shares repurchased 143,717siri_TreasuryStockSharesAcquiredCostMethodIncludingAcceleratedStockRepurchaseProgram 39,500siri_TreasuryStockSharesAcquiredCostMethodIncludingAcceleratedStockRepurchaseProgram  
Stock repurchased during period, value $ 534,040siri_TreasuryStockValueAcquiredCostMethodIncludingAcceleratedStockRepurchaseProgram $ 128,682siri_TreasuryStockValueAcquiredCostMethodIncludingAcceleratedStockRepurchaseProgram  
Common Stock [Member]      
Subsequent Event [Line Items]      
Number of shares repurchased 0siri_TreasuryStockSharesAcquiredCostMethodIncludingAcceleratedStockRepurchaseProgram
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		   
Stock repurchased during period, value 0siri_TreasuryStockValueAcquiredCostMethodIncludingAcceleratedStockRepurchaseProgram
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		   
Common Stock [Member] | Open Market And Privately Negotiated Repurchases [Member]      
Subsequent Event [Line Items]      
Number of shares repurchased 143,717siri_TreasuryStockSharesAcquiredCostMethodIncludingAcceleratedStockRepurchaseProgram
/ us-gaap_ShareRepurchaseProgramAxis
= siri_OpenMarketAndPrivatelyNegotiatedMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		[1] 39,500siri_TreasuryStockSharesAcquiredCostMethodIncludingAcceleratedStockRepurchaseProgram
/ us-gaap_ShareRepurchaseProgramAxis
= siri_OpenMarketAndPrivatelyNegotiatedMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		[1]  
Stock repurchased during period, value 534,040siri_TreasuryStockValueAcquiredCostMethodIncludingAcceleratedStockRepurchaseProgram
/ us-gaap_ShareRepurchaseProgramAxis
= siri_OpenMarketAndPrivatelyNegotiatedMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		[1] 128,682siri_TreasuryStockValueAcquiredCostMethodIncludingAcceleratedStockRepurchaseProgram
/ us-gaap_ShareRepurchaseProgramAxis
= siri_OpenMarketAndPrivatelyNegotiatedMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		[1]  
Subsequent Event [Member] | Common Stock [Member] | Open Market And Privately Negotiated Repurchases [Member]      
Subsequent Event [Line Items]      
Number of shares repurchased     34,835siri_TreasuryStockSharesAcquiredCostMethodIncludingAcceleratedStockRepurchaseProgram
/ us-gaap_ShareRepurchaseProgramAxis
= siri_OpenMarketAndPrivatelyNegotiatedMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Stock repurchased during period, value     $ 136,616siri_TreasuryStockValueAcquiredCostMethodIncludingAcceleratedStockRepurchaseProgram
/ us-gaap_ShareRepurchaseProgramAxis
= siri_OpenMarketAndPrivatelyNegotiatedMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
[1] As of March 31, 2015, $24,858 of common stock repurchases had not settled, nor been retired, and were recorded as Treasury stock within our unaudited consolidated balance sheets and unaudited consolidated statements of stockholders' equity.