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Related Party Transactions (Information Related to Satellite Construction Contracts with Telesat) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Satellite construction contracts        
Revenues $ 9,363 $ 32,770 $ 55,946 $ 108,615
Telesat [Member]
       
Satellite construction contracts        
Revenues 9,383 32,754 56,095 108,579
Milestone payments received from Telesat $ 17,626 $ 24,271 $ 51,931 $ 96,389