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Segments (Narrative) (Detail) (USD $)	3 Months Ended		9 Months Ended
Segments (Narrative) (Detail) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Segment	Sep. 30, 2011	Dec. 31, 2011
Financial information of reportable segments [Line Items ]
Number of operating segments			2
Revenue from related parties	$ 9,363,000	$ 32,770,000	$ 55,946,000	$ 108,615,000
Equity Method Investee Goodwill	2,400,000,000		2,400,000,000		2,400,000,000
Telesat [Member]
Financial information of reportable segments [Line Items ]
Unconsolidated segment revenue eliminated	100.00%	100.00%	100.00%	100.00%
Percentage of ownership interest	64.00%		64.00%
Revenue from related parties	$ 9,400,000	$ 32,800,000	$ 56,100,000	$ 108,600,000

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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