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General (Narrative) (Details) (USD $)
 1 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 3 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Federmann Group [Member]
Dec. 15, 2010
ESA [Member]
Sep. 30, 2011
Embraer Defesa [Member]
Sep. 30, 2011
AEL Sistemas S.A. [Member]
Dec. 31, 2011
Netcity [Member]
Dec. 31, 2010
Netcity [Member]
Feb. 24, 2009
ESLC [Member]
Mar. 30, 2011
Elisra [Member]
Apr. 07, 2009
Kinetics [Member]
Sep. 30, 2011
FV [Member]
Dec. 31, 2011
FV [Member]
Dec. 31, 2010
FV [Member]
Jun. 15, 2009
Mikal [Member]
Oct. 14, 2010
Mikal [Member]
Feb. 09, 2011
ITL [Member]
Oct. 14, 2010
ITL [Member]
Mar. 31, 2011
Elite [Member]
Jun. 30, 2011
C4 [Member]
Nov. 30, 2008
Azimuth [Member]
Dec. 01, 2010
Ares And Periscopio [Member]
Nov. 19, 2009
BVR [Member]
Oct. 14, 2010
Soltam And Saymar [Member]
Nov. 30, 2011
UAS Dynamics LLC [Member]
ESA [Member]
Business Acquisition [Line Items]                                                      
Ownership percentage 50.00% 50.00%     45.75%   51.00%                                       50.00%
Ownership percentage, common stock                             $ 55.5         $ 87.85           $ 100  
Ownership percentage in subsidiaries             25.00% 49.00% 40.00%     30.00%           19.00%                  
Acquisition date                       March 30, 2011         June 15, 2009   February 9, 2011   April 1, 2011 June 30, 2011 November 2008 December 1, 2010 November 19, 2009    
Amount of export authorization to supply systems to foreign customers 90,000,000                                                    
Operating expenses 72,800,000 616,350,000 590,517,000 587,026,000                                              
Operating expenses, net of taxes 62,000,000                                                    
Additions to equity method investments                 8,100,000 2,700,000                                  
Business acquisition purchase price           85,000         16,000,000                   8,200,000 10,900,000 50,000,000 38,000,000 35,000,000 80,500,000  
Acquisition-date fair value, equity                       67,500,000             5,900,000                
Acquisition-date equity percentage                                             81.00%        
Subsidiary investment             3,400,000                                        
Business acquisition purchase price, per share                                     $ 3.4                
Business acquisition percentage 20.00% 20.00%                                 87.85%       19.00%        
Purchase price contingent consideration                                           6,900,000       10,200,000  
Cash paid for acquisition                         110,250,000                   41,500,000        
Equity interest in acquiree, fair value                                             8,500,000        
Business combination remeasurement gain                                             4,756,000        
Acquisition gain included in other income, net                                             1,600,000        
Business acquisition description                         On April 7, 2009, the Company completed the purchase of the additional shares of its previously 51%-owned subsidiary Kinetics Ltd. ("Kinetics"). Elbit Systems purchased the remaining 49% of the shares from Kinetics' non-controlling shareholdersfor a purchase price of $110,250. As this was an equity transaction between the parent and Kinetics' non-controlling shareholders, the Company reduced its shareholders' equity for the excess costs over book value related to minority interest in Kinetics (which amounted to approximately $43,000), as required in accordance with ASC 810, "Consolidation".                            
Loan provided to subsidiary                                 18,000,000                    
Impairment loss   15,977,000 1,284,000 3,017,000                   16,000,000                          
Impairment loss related to non-controlling interest                           6,500,000                          
Net impairment loss                           9,500,000                          
Net assets                             1,748,000 14,727,000                      
Reduction in shareholders' equity due to excess of costs over book value of minority interest                         $ 43,000,000