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Goodwill (Details) (USD $)
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12 Months Ended | |||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Nov. 04, 2013
Agero, Inc. [Member]
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| Goodwill [Line Items] | ||||
| Goodwill | $ 2,204,553,000 | $ 1,815,365,000 | $ 389,462,000 | |
| Impairment loss for goodwill | 0 | 0 | 0 | |
| Accumulated impairment of goodwill since the Merger | 4,766,190,000 | |||
| Goodwill reduced for the exercise and vesting of certain stock awards | $ 274,000 | $ 19,491,000 | $ 0 | |
| X | ||||||||||
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- Definition
Reduction of Goodwill related to the subsequent exercise of certain stock options and vesting of certain restricted stock units that were recorded at fair value in connection with the July 2008 merger between our wholly owned subsidiary, Vernon Merger Corporation, and XM Satellite Radio Holdings Inc. ("the Merger") as a result of the release of the deferred income tax valuation allowance. No definition available.
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| X | ||||||||||
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- Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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