Commitments and Contingencies (Details Textual) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Jun. 30, 2010
Mar. 31, 2010
Jun. 30, 2013
Commitments And Contingencies [Line Items]            
Credit facility $ 1,313,769,000   $ 1,291,401,000      
Unused Portion Credit Facility 486,200,000          
Minimum Required Cash Reserve Balance For Credit Facility 88,500,000          
Minimum Required Cash Reserve Balance For Credit Facility At Beginning Of Repayment Period 189,000,000          
Interest Expense 14,900,000 12,000,000        
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.80%          
Line Of Credit Facility, Commitment Fee Payable 2,200,000          
Line Of Credit Facility Interest Payable In Cash 4,500,000 3,700,000        
Line Of Credit Facility Interest Payable In Deemed Loans 10,400,000 8,300,000        
Interest Expense, Debt   12,000,000        
Interest payable 24,544,000   9,589,000      
FSD [Member]            
Commitments And Contingencies [Line Items]            
Commitments Price For Design and Build Of Satellites       2,300,000,000    
Thales Alenia Space France [Member]            
Commitments And Contingencies [Line Items]            
Construction in Progress, Gross 1,353,800,000          
Construction In Progress Funded By Credit Facility 1,150,800,000          
Invoice Received Payment Term Description The Company currently uses the Credit Facility to pay 85% of each invoice received from Thales under the FSD with the remaining 15% funded from cash on hand. Once the Credit Facility is fully drawn, the Company expects to pay 100% of each invoice received from Thales from cash and marketable securities on hand as well as internally generated cash flow          
Space Exploration Technologies Corp [Member]            
Commitments And Contingencies [Line Items]            
Construction in Progress, Gross 164,300,000          
Maximum Commitments Amount         453,100,000  
Refundable Deposit   3,000,000        
Kosmotras [Member]            
Commitments And Contingencies [Line Items]            
Construction in Progress, Gross 30,800,000          
Purchase Obligation Amount For Single Launch           $ 51,800,000