Subsequent Events (Details) (USD $)	6 Months Ended
Jun. 30, 2011	Jun. 14, 2011
Subsequent Events
Portion of acquisition cost paid in cash	$ 68,750,000
TerreStar Networks, Inc. ("TerreStar") \| Gamma Acquisition L.L.C. ("Gamma")
Subsequent Events
Purchase price of assets		1,375,000,000
Portion of acquisition cost paid in cash	69,000,000
Expected future payment of acquisition cost	$ 1,276,000,000

The cash outflow associated with other payments to acquire businesses including deposit on pending acquisitions and preacquisition costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 15, 17
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585

Name:	us-gaap_OtherPaymentsToAcquireBusinesses
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration